Given that detector measures total energy of 0.53 J over a period of 34s. Photons per second emitted by the laser is 7.84 x 10¹⁶ photons/s
Device that emits a beam of coherent light through an optical amplification process is called Laser. Types of lasers include gas lasers, fiber lasers, solid state lasers, dye lasers and diode lasers .
Given total energy = 0.53 J
period = 34 s
As we know Wavelength of the Photon = 989 nm
Energy of single photon is given by formula,
E= hc/λ
Total energy= (6.626* 10^-34*2.998*10^8)/(989*10^-9)
= 2.01 *10^-19 J
Time period = 34s
Energy absorbed per sec = 0.53/34= 0.0155 J/s
Energy of a photon= 2.01*10^-19 J
Number of photons emitted per second is = 0.0155/2.01*10^-19
= 7.711* 10^16 J/photon
Number of photons = 7.771 x 10¹⁶ photons/s
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Please Help, Please show all work! I would really appreciate it.
The acceleration of the object is obtained as -1 m/s^2.
What is the acceleration?We have to recall that acceleration would be defined as the rate at which the velocity can be changed at a given time. We should now look at the formula that could help us to get the acceleration of the object.
a = v - u/t
a = acceleration
v = final velocity
u = initial velocity
t = time taken
Thus we can now be able to correctly carry out the substitution of the values and we have;
a = 2 - 7/5
a = -1 m/s^2
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adjustment of the lens by the ciliary body: a.photophobia b.refraction c.amblyopia d.accommodation e.binocular vision
Adjustment of the lens by the ciliary body is accommodation.
The correct option is D.
Briefing:The lens is stretched and its refractive strength is changed by the zonule, a collective term for the suspensory ligaments that the ciliary bodies anchor. Relaxation of the zonule allows for accommodation for nearby items.
What is ciliary body of the eye?A section of the central portion of the eye's wall. The ring-shaped muscle that modifies the curvature of the lens whenever the eye focuses is part of the ciliary body, which is located behind the iris. Additionally, it creates the transparent liquid that fills the area between the iris and the cornea.
What materials makes up the ciliary body?There are muscles, blood vessels, and epithelium in the ciliary body.
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At the micro level, what is the difference between an unmagnetized iron nail and a magnetized iron nail?.
The main difference in between magnetized and unmagnetized iron nails is the alignment of the magnetic domains.
What is magnetization?
The density of induced or permanent dipole moments in a specific magnetic material is measured by magnetization, also known as magnetic polarisation. We already know that the magnetic moment, which would be produced by the motion of electrons within atoms, the spin of electrons, or the nuclei, results in magnetization. In addition to any unbalanced magnetic dipole moment that is present due to the motion of the material's electrons, as was previously mentioned, the response of the a material to a external magnetic field determines its net magnetization. We can categorise materials according to their magnetic properties with the aid of the concept of magnetization. We will learn further about magnetization as well as the idea of magnetic intensity in this section.
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What is MOST likely TRUE about a person who has a healthy diet?
The MOST likely TRUE about a person who has a healthy diet is they avoid all fats and sugars (Option B).
What is a healthy diet?A healthy diet is one that includes macronutrients (i.e. proteins, carbohydrates and lipids or fats) and micronutrients (vitamins and minerals) in a suitable amount. It is well known that fats and sugars may provide calories but they do not contain nutrients and therefore should be avoided in a healthy diet.
Therefore, with this data, we can see that a healthy diet is based on the consumption of foods that contain a suitable amount of macronutrients and micronutrients.
Complete question:
What is MOST likely TRUE about a person who has a healthy diet?
OA. They eat occasional treats.
OB. They avoid all fats and sugars.
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a piston–cylinder device contains 4 kg of argon at 250 kpa and 35°c. during a quasi-equilibrium, isothermal expansion process, 15 kj of boundary work is done by the system, and 3 kj of paddle-wheel work is done on the system. determine the heat transfer for this process
Heat transfer for this process is 12KJ.
m= 4 kg
P₁ = 250 KPa
T₁ = 35⁰C = 308 K
Work done by the system ,W₁= 15 KJ
Work is done on the system W₂ = - 3 KJ =
Since isothermal expansion is taking place, that's why temperature of the gas will remain constant.
Isothermal expansion is a kind of expansion process occurring at a constant temperature.
As we know that the internal energy of the ideal gas depends only on the temperature of the gas, so the change in the internal energy of the gas will be zero because change in the temperature is zero.
According to the first law of thermodynamics
Q = W + ΔU
Q= Heat ,
W = Net Work ,
ΔU = Change in the internal energy
Here ΔU = 0
Q= W
Q = W₁ + W₂
Q= 15 - 3 KJ
Q= 12 KJ
The heat transfer for this process is 12 KJ.
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Gravity is the centripetal force that holds the Earth in orbit around the Sun. Where does this centripetal force vector
point?
a. Toward the center of the Sun
b. Toward the center of the Earth
c. In the direction of the Earth’s orbit
d. In a straight line away from the Sun
Explanation:
b. Toward the center of the Earth
What does it mean if the percent transmittance of light through a sample is 100% at a given wavelength?.
If all the light passes through a solution without any absorption, then absorbance is zero, and percent transmittance is 100%. If all the light is absorbed, then percent transmittance is zero, and absorption is infinite.
What does a high percent transmittance mean?
A surface will let more light to pass if the % transmittance number is high. Similar to this, if the % transmittance number is low, it indicates that the surface absorbs more light.
If you move the light from a block of semitransparent glass. Let's imagine that the glass surface reflects 30 percent of the light. 70% of the light will attempt to pass through the glass block. However, part of the light will be absorbed by the light molecules. Say there is 35% light. Now the other side of the block will let through the final 35% of the light. It denotes a 35% transmittance for the glass block.
Hence, If all the light is absorbed, then percent transmittance is zero, and absorption is infinite.
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when using the transit method, why is it easier to detect gas giants (like jovian planets) than earth-sized planets?
When planets have relatively close orbits and when at least one of them is more massive, causing the orbital period of a less large planet to be more perturbed, it is simpler to spot transit-timing fluctuations.
What is the transit method best for?The most reliable and sensitive method for finding extrasolar planets right now is transit photometry. For room observatories that can look unceasingly at stars for weeks or months, it is a very useful technique.
What does the astronomical transit method involve?The bulk of exoplanets that are currently known were discovered via the transit method. Transiting refers to the movement of the earth past a star and an observer. Transits within our cosmos can be witnessed from Earth when Mercury or Venus pass in front of the Earth and the Sun.
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7. A ball is thrown horizontally from the roof of a building 50. m tall and lands
45 m from the base. What was the ball's initial speed?
The initial speed of the ball is 14.08m/s
We are given that,
The height of the building = h = 50m
The distance of land from base = d = 45m
Therefore, for getting the value of the initial speed v , first we have to know the time period of the ball that is thrown from building horizontally, so that taking the equation of motion in term of time and distance, then we can write as,
h = ut + (1/2) at²
Where, h is the height of the building , u is the initial speed that can be taken zero, a is the acceleration due to gravity which can be put as 9.8m/s²
50m = 0 + (1/2) (9.8m/s² )(t²)
(t²) = 10.204 s
t = 3.194 s
Thus , the initial speed of the ball in the horizontal direction can be calculated as,
Speed = distance/time
v = 45m / 3.194s
v = 14.08 m/s
Since, the initial speed of the ball would be 14.08m/s.
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a vessel at rest at the origin of an xy coordinate system explodes into three pieces. just after the explosion, one piece, of mass m, moves with velocity and a second piece, also of mass m, moves with velocity . the third piece has mass 3m. just after the explosion, what are th
Solution:
Our notation (and, implicitly, our choice of coordinate system) is as follows:
the mass of one piece is m1 =m
its velocity is v1 vector = (−30m/s) i^ ;
the mass of the second piece is m2 = m ;
its velocity is ν2 vector = (−30m/s) j^;
and mass of the third piece is m3=3m .
(a) Conservation of linear momentum requires
mν0 vector = m1v1 + m2v2 + m3v3
0=m(−30i )+m(−30j^)+3m ν3 vector
which leads to ν3=(10i^+10 j^)m/s . Its magnitude is v3 = root 2 ≈14m/s .
(b) The direction is 45∘counter clockwise from +x (in this system where we have m1 flying off in the –x direction and m2 flying off in the –y direction) .
Velocity is defined as a vector size of the fee and path of motion. put virtually, speed is the speed at which something actions in a single path. the rate of a vehicle travelling north on a first-rate expressway and the rate a rocket launching into space can both be measured the usage of pace.
Velocity is a noun plural -ties. velocity of motion, movement, or operation; rapidity; swiftness. Physics a measure of the fee of motion of a body expressed as the charge of trade of its function in a specific path with time.
The SI (international) units for velocity are m/s (meters consistent with second), however speed may also be expressed in any gadgets of distance per time. other gadgets consist of miles in keeping with hour (mph), kilometers according to hour (kph), and kilometers in line with 2nd (km/s).
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What is the correct expression for the small dog’s force magnitude Fs on the bone?
The correct expression for the force applied by the small dog is determined as Fs = ma + Fb.
What is the net force on the bone?
The net force on the bone will determine the direction of the bone's acceleration. The net force on the bone is determined by applying Newton's second law of motion.
If the acceleration of the bone is towards the right (rightward), the direction of the net force will be towards the right. This implies that the force applied by the dog on the right (S) is greater than the force applied by the dog on the left (B).
F(net) = Fs - Fb
The acceleration of the bone is calculated from the net force by applying Newton's second law of motion.
a = F(net) / m
a = (Fs - Fb)/m
make Fs the subject of the formula;
Fs - Fb = ma
Fs = ma + Fb
Thus, the correct expression for the force applied by the small dog is determined as Fs = ma + Fb.
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Basic Electrical Quantities: Solve the following problems .
A lightning strike carries 5.0 C of charge in the 0.02 s it takes to reach the ground. What is the electric current carried by the lightning strike . please I need a answer fast
The electric current carried by the lightning strike, given it carries 5.0 coulomb in 0.02 second is 250 A. Details below
How to determine the electric currentWe'll begin by writing out the equation relating quantity of electricity, electric current and time. The equation is illustrated below:
Q = It
Where
Q is the quantity of electricity in coulomb (C)I is the electric current in ampere (A)t is the time in second (s)With the above formula, we can obtain the electric current. Details below
From the question given above, the following data were obtained:
Quantity of electricity (Q) = 5.0 CTime (t) = 0.02 sElectric current (I) =?Q = It
5 = I × 0.02
Divide both sides by 0.02
I = 5 / 0.02
I = 250 A
Thus, from the calculation made above, we can draw our conclusion that the electric current carried by the lightning strike is 250 A
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a ice block floating in a river is pushed through a displacement along a straight embankment by rushing water, which exerts a force on the block. how much work does the force do on the block during the displacement?
The amount of work that the force do on the block during the displacement is 4950 Joules.
The work done by a body is given by
W = F.S
Where,
W is the work done,
F is the force applied,
S is the displacement.
Work done is a scalar quantity that is found by the dot product of the force and the displacement of the body.
The force applied by the rushing water is given to be exerted is (210N)i-(150N)j
The displacement is given to be (15m)I - (12m)j.
Now, putting all the values,
W = (210i-150j)(15i-12j)
W = 4950 Joules.
So, the work done by the force to move the ice block is 4950 Joules.
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Complete question - A floating ice block is pushed through a displacement vector d= (15 m)i - (12 m)j along a straight embankment by rushing water, which exerts a force vector F = (210 N)i - (150 N)j on the block. How much work does the force do on the block during the displacement?
Question
A migrating bird can travel at a speed of 30 m/s. How far will it travel
in 25 minutes at this speed? Give your answer in metres (m), and in
kilometres (km).
Migrating bird that can travel at a speed of 30 m/s. It will travel 45 km (45000 m) in 25 minutes at this speed.
It will travel,
45 km (45000 m)
25 minutes is,
1500 seconds
as ,(25*60=1500)
distance is,
(speed*time)
distance=30m/s * 1500s -> 45000 m
-> 45 km
so, migrating bird will travel 45 km (45000 m)
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How do we know light is a kind of wave?
A wave is a disturbance that travels from one point to another in a medium. This disturbance can also be referred to as variation in energy. Light consists of energy derived from oscillating magnetic and electric fields. As light moves, it carries this energy from the source to another location. Also, waves have frequency and wavelength. Given these characteristics of light, we can conclude that
light is a kind of wave
an airplane flying at an altitude of 120 m is dropping a package to some stranded hikers. ifthe aircraft is moving at 95 m/s, how far from the hikers should the package be dropped sothat it lands at their location?
The package should be dropped at a horizontal distance of 465.4 Meters away from the hikers.
The package dropped from the aircraft will have a path of a projectile.
The speed of the aircraft is 95m/s.
The aircraft is 20 m above the hikers.
The initial velocity of the package will also be 95m/s.
The horizontal range of the projectile is given by,
R = u√(2h/g)
Where you is the initial velocity,
u is the height,
g is acceleration due to gravity.
Now, putting all the values,
R = 95(√(2(120)/10))
R = 465.4 m.
Show the aircraft should drop the package at a distance of 465.4 m away from the hikers.
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An object is projected from the ground at an angle of 30o above the horizontal and returns to the ground 8 seconds later. What is the object’s maximum height?
The object's maximum height during projectile motion is 78.4 m.
We need to know about the projectile motion to solve this problem. The projectile motion is known as parabolic motion and the velocity is divided by 2 axes.
vox = vo cosA
voy = vo sinA
where vox is initial velocity of x axis, voy is initial velocity of y axis, vo is initial velocity and A is the angle.
The total time taken during projectile motion is
t = 2(voy)/g
where t is total time and g is the gravitational acceleration (9.8 m/s²)
The maximum height also can be found using this formula
ymax = voy² / 2g
where ymax is the maximum height
From the question above, the given parameters are
A = 30⁰
t = 8 s
Find the initial velocity of y axis
t = 2(voy)/g
8 = 2 . voy / 9.8
voy = 39.2 m/s
Find the maximum object's height
ymax = voy² / 2g
ymax = 39.2² / 2 . 9.8
ymax = 78.4 m
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how much force is needed to lift a 24-kg mass??
pls, i need help loll
Answer:lol
Explanation:
When the positively charged rod Q is brought close to rod R, rod R moves away from rod Q.
Which conclusion can be made from this observation?
A Rod R is charged, but it is not possible to identify the sign of the charge.
B Rod R must be positively charged.
C Rod R must be negatively charged.
D Rod R is uncharged.
Answer:
B rod r is positively charged
Particles in a warmer block will have ________ kinetic energy and move ______than the particles in the colder block.
Particles in a warmer block will have ________ kinetic energy and move ______than the particles in the colder block.
Particles in a warmer block will have more kinetic energy and travel more quickly than particles in a cooler block.
What exactly is kinetic energy?
The initial energy determines the energy that an object has as a function of motion. It is defined as the effort necessary to move a physical object from rest to the specified velocity.
The kinetic energy of the particles increases with temperature, which causes them to move more swiftly. In gases compared to solids, particles have more kinetic energy.
Particles in a warmer block will therefore possess more kinetic energy and travel more quickly than those in a colder block.
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what current in a solenoid 15.0-cm long wound with 100 turns would produce a magnetic field equal to that of the earth, 5.00 x 10-5 t?
A solenoid 15.0-cm length and wound without 100 turns would generate a magnetic field of 5.00 x 10-5 t at 60 mA current.
The correct answer is 60mA
What exactly is indeed a magnetic field, in simple terms?The magnetic field is the area that is affected by magnetism and is located around a magnet. The magnetic field is a valuable tool for explaining the distribution of the magnetic force within and around magnetic object in nature.
where is The magnetic field ?The surface magnetic field and Earth's magnetic field are roughly magnetic dipoles, with the magnetic field's S pole located close to the planet's geographic north pole (see Magnetic North Pole) as well as the magnetic field's N pole located close to the planet's geographic south pole (see Magnetic South Pole).
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what does a flat horizontal line on a graph mean?
a. the object is moving fast
b. the object is motionless
c. the object is gaining speed
d. the object is moving back to its original position
A force of 57.1 Newtons is applied for 0.977 meters; what work was done on the object?(1 point)
Responses
58.1 J
58.1 J
56.1 J
56.1 J
55.8 J
55.8 J
58.4 J
If A force of 57.1 N is applied for 0.977 meters then work is done on the object is 55.8J .
What is displacement?Displacement is defined as the shortest distance travelled by the object.
Displacement is defined to be the change in position of an object.
it has both magnitude and direction. it is a vector quantity.
What is force?An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.
A spring balance can be used to calculate the Force. Newton is the SI unit of force (N).
mathematically, F=ma
where, F = force
m = mass and a = acceleration
Given,
force Applied is 57.1N .
displacement is 0.977 m.
According to the formula of work done,
work = force × displacement
Work = 57.1N×0.977m
Work = 55.78J
work = 55.8J
Hence, if A force of 57.1 N is applied for 0.977 meters then work is done on the object is 55.8J .
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Answer:
55.8 J
Explanation:
An astronaut on the moon weighs approximately 1/6 as much as on earth. How will the astronaut’s inertia change on the moon?.
The astronaut's inertia will not change on the moon.
What is inertia?Inertia can be defined as the property of a matter that causes a matter to be at rest or continuous motion in a straight line.
Inertia depends on the mass of an object, the more massive an object is, the greater the inertia and the smaller the mass of an object, the lesser the inertia.
The weight of an object is given as the product of mass and acceleration due to gravity.
W = mg
where;
m is the mass of the objectg is acceleration due to gravityThe mass of the astronaut will be constant, only the weight will change due to difference in the value of acceleration due to gravity.
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a car accelerates from 6 m/s to 22.0 m/s at a rate of 3.00 m/s2. how far does the car travel while accelerating?
The total distance traveled by the car when accelerating at a rate of 3 m/s² is 74.67 meters.
Acceleration is the rate at which an object's velocity with respect to time changes. Acceleration is a vector quantity. The direction of the net force acting on an object determines the direction of its acceleration.
The car accelerates from 6 m/s to 22 m/s.
Therefore,
The initial velocity of the car, u = 6 m/s
The final velocity of the car, v = 22 m/s
The acceleration of the car, a = 3 m/s²
By using the equation of motion,
v² - u² = 2as
s = ( v² - u² ) / 2a
s = ( 22² - 6² ) / 6
s = ( 484 - 36 ) / 6
s = 448 / 6
s = 74.67 meters
The car travels 74.67 meters while accelerating.
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If a star is moving towards earth,it is
Answer:
Explanation:
If a star is moving toward Earth, it is blue-shifted. Light is an electromagnetic wave that has a range of colors
HELP 2. How do the positions of the particles in a solid compare with the positions of the particles
in an equal volume of liquid?
The particles of a solid have fewer options available to them than the particles of the same molecules in a liquid.
Because the interactions between particles are stronger in a solid, there are fewer ways that they can move around, and this limits their freedom to change position.
In a liquid, there is no boundary. The amount of fluid you have depends on the container and the size of your container; the more surface area you have, the more fluid there is. The only way to define the boundaries of a solid is by using a mathematical formula.
For example, if you stand at the bottom of a cliff, then drop something off it, making for another particle of equal size which is placed at some random point on the cliff (this is not obvious), then what you will find at the end of your experiment is that it is less probable that there will be one particle in front of the second one than it would be if an equal volume of liquid was present instead.
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Which of the picture demonstrates a state of matter wirh a fixed shape and a fixed volume
Answer:
option (j) because the particles are tightly packed and it's clear in the pic that it has fixed shape and there is no space to move
Which of the following correctly displays the four fundamental forces in terms of decreasing range?
O a
Ob
Oc
Od
Electromagnetic force, weak nuclear force, gravity, strong nuclear force
Gravity, electromagnetic force, strong nuclear force, weak nuclear force
Weak nuclear forfe, gravity, strong nuclear force, electromagnetic force
Strong nuclear force, gravity, weak nuclear force, electromagnetic force
The correct order of four fundamental forces in terms of decreasing range is as follows:
Strong nuclear force >electromagnetic force > weak nuclear force > gravitational force
The strong nuclear force is what holds the fundamental particles together to create larger particles. The masses of the bodies and the separation between their centers of mass determine the gravitational pull. The decay of the particle is caused by the weak nuclear force.Between charged particles, an electromagnetic force operates. These definitions aid us in understanding the hierarchy of the forces.What is Force?A force is an effect that can alter an object's motion in physics. An object having mass can vary its velocity, or accelerate, in response to a force. Force can also be conceptualized as a push or a pull. A force is a vector quantity that has a magnitude and direction, and it is measured in the SI unit of newton (N).The net force acting on an object is equivalent to the rate at which its momentum varies over time, according to Newton's second law in its original version.This law states that, if the mass of the item is constant, the acceleration of the object is inversely proportional to its mass and directly proportional to the net force acting on it. It also states that the acceleration is in the direction of the net force.To learn more about Force, refer to:
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In which phase change are hydrogen bonds formed?
sublimation
freezing
boiling
evaporation
The phase change in which hydrogen bonds are formed is freezing. That is option B.
What is phase change?Phase change is defined as the process that matter passes through in which there is change in state of matter from one form to another.
The different phase changes of matter include the following:
Melting.Freezing.Evaporation. Condensation.Freezing is defined as the phase change through which a liquid medium changes to a solid medium leading to the formation of ice.
Ice contains more hydrogen bonds than water. That is to say that freezing is the phase change in which hydrogen bonds are formed most.
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Answer:
1. condensation
2. heat of vaporization
3. freezing
4. 68.8J
Explanation:
States of Matter Quick Check
