Which of the following describe advantages of using radio waves over other electromagnetic waves to transmit information to Earth? Select ALL that apply.

A
Radio waves travel faster.

B
Radio waves take less energy to produce.

C
Radio waves transmit more types of information.

D
Radio waves have a lower frequency, which makes them safer for humans.

E
Radio waves have higher energy, which makes their signal easier to capture.

Answer:

Explanation:

Formula

Electric Force formula

F = k * q1 * q2 / r^2

Gravitation Force Formula

F  = G * m1 * m2 / r^2

Givens

k = 8.99 * 10^9 N m^2/C^2

G = 6.67 * 10^-11  N m^2 /kg^2

Solutions

Fe = 8.99 * 10^9 * 1.6 * 10^-19 ^2/ 8.4 * 10^-11

The force = the electric force constant * the charge of the proton*charge  electron/ distance apart in meters. It looks small but actually it is quite large in comparison to the Gravitational Force

Fe = 3.2 * 10^-8 (Answer First Box)

Fg = 6.67 * 10^- 11 * 9.11*10^-31 * 1.67*10^-27 / 8.4 * 10^-11

The gravitational Force is very small. Just look at the powers which come to 10^-68 - -22 = - 46 which is about 6 times smaller than the electric force.

Fg = 1.44 * 10^-47 (Answer Second Box)

A film of soapy water (n = 1. 33) on top of a plastic cutting board (n > 1. 33) has a thickness of 147 nm. The color that is most strongly reflected if it is illuminated perpendicular to its surface is 294nm.

When the light is reflected it experiences a half of phase change. Then, the ray will be refracted by travelling through the soapy water down due to the refractive index. It will hit the second boundary which is plastic but light does not pass through the plastic. This will again reflect with again half of a phase change.

So, the formula used is:

2t = λ / 2 +  λ / 2

Given,

refractive index of soap = 1.33

refractive index of air = 1

The relation between the thickness of the board and the wavelength used is as follows:

2t = λ / 2 +  λ / 2

where, t is the thickness

           λ is wavelength

On solving,

2t =  λ

On substituting in above equation,

2(147) =  λ

λ = 294nm

The color that is most strongly reflected if it is illuminated perpendicular to its surface is 294nm.

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The main transformation of energy is chemical energy to motion energy.

Jay's body converted chemical energy into mechanical energy to wind up the key. Mechanical energy in the key's winding was transformed into potential energy in the spring. The spring then strives to release itself, and as the toy car rolls forward, the potential energy is transformed into kinetic energy or motion energy.

Chemical energy is the energy that is released when chemical substances engage in a chemical reaction and change into other substances.

Potential energy is the power that an object can store as a result of its position in relation to other objects, internal tensions, electric charge, or other circumstances.

The energy that an object has as a result of motion is known as kinetic energy. It is described as the effort required to move a mass-determined body from rest to the indicated velocity.

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Hope this is correct.

Answer:

elastic energy

Explanation:

hope it helps you

A 60-m long wire is coiled so that it makes a coil containing 140 square loops, one on top of each other. if the wire carries a current of 21 a, the magnetic dipole moment of the coil will be 0.24 Am2

Dipole moment = i * A

Area = ?

given total length of the wire = 60 m number of square loops = 140total length of the wire  =  n * ( circumference of one loop) circumference of one loop = total length of the wire   / n  = 60 / 140 = 0.429 m circumference of one loop  = 4 * (side of the square )                                  0.429 = 4 * a a = [tex]0.107 m[/tex]

Area of  loop = [tex]a^{2}[/tex]=  [tex](0.107)^{2}[/tex]  = [tex]0.01145 m^{2}[/tex]

Dipole moment = i * A  = 21 * 0.01145 = 0.24 A  [tex]m^{2}[/tex]

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There will be no heat transmission, and the system's work is 25.27 Kj.

The calculation for total heat transfer and work production:

Provided,

The mass of r-134a = 0.7 kg

Initial pressure of the system, P₁ = 800 kpa

Initial temperature of r-134a, T₁ = 50°C = 273+ 50 = 323 K

Final pressure of the system, P₂ = 140 kpa

From the superheated refrigerant r-134a

P₁ = 800 kpa & T₁ = 50°C

the internal energy, u₁ = 263.87 Kj/kg &

the entropy, s₁ = 0.9803 Kj/kg .K

There won't be any heat transmission because the process is isentropic.

So, Q = 0 KJ

Due to the isentropic nature of the operation, the ultimate entropy is determined by

s₂ = s₁ = 0.9803 Kj/kg .K

From the r-134a superheated refrigerant

at P₂ = 140 kpa & entropy s₂ = 0.9803 Kj/kg .K

the internal energy,u₂ = 227.77 K/kg

The work on the system is provided by

W = m x (u₂-u₁)

W = 0.7 x(227.77 - 263.87)

W = 0.7 x (-36.1)

W = -25.27 KJ

A negative number means the system is doing the task.

As a result, there won't be any heat transfer, and the system will only have used 25.27 KJ of energy.

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Answer:

1 because gravity pulls the object down towards the centre of the Earth.

Out of a 1. 0-μf capacitor rated at 250 v or a 470-pf capacitor rated at 3 kV , a 1. 0-μf capacitor rated at 250 v will have more capacitance than the other one .

A capacitor is a two-terminal electrical device that possesses the ability to store energy in the form of an electric charge. It consists of two electrical conductors that are separated by a distance. The space between the conductors may be filled by vacuum or with an insulating material known as a dielectric.

Work has to be done to transfer charges onto a conductor, against the force of repulsion from the already existing charges on it. This work is stored as a potential energy of the electric field of the conductor.

Energy stored in a capacitor1 = 1/2 * C1 * [tex]V1^{2}[/tex]

                                                 = 1/2 * ( 1 * [tex]10^{-6}[/tex]) * 250

                                                 = 31250 * [tex]10^{-6}[/tex] J

Energy stored in a capacitor2 = 1/2 * C2 * [tex]V2^{2}[/tex]

                                                   = 1/2 * ( 470 * [tex]10^{-12}[/tex] ) * [tex](3000)^{2}[/tex]

                                                   = 2115 * [tex]10^{-6}[/tex] J

capacitor 1 can store more energy  

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The Sun's apparent yearly path across planet Earth's sky against the background stars wouldn't be described as the celestial equator.

A solar system can be defined as a collection of the outer and inner planetary (astronomical) bodies alongside the Moon that are in orbit around the Sun, in slightly elliptical orbits.  

Basically, there are nine (9) planets in the solar system and these include;

Based on astronomical records and information, we can infer and logically deduce that the Sun's apparent yearly path across planet Earth's sky against the background stars wouldn't be described as the celestial equator.

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The total energy transported per hour along a narrow cylindrical laser beam 2. 40 mm in diameter, whose b-field has a RMS strength of 1. 30×10−10 will be 6.40 × 10⁻⁸J.

Intensity for an electromagnetic wave is energy crossed per second in the direction perpendicular to the propogation of electromagnetic wave which is passing per unit area.

The Intensity for an electromagnetic wave is given by:

I = cε₀E₀²

where c is the speed of light,

           E₀ is the maximum value of the electric vector

           ε₀ is the permitivitty of medium

           I is the intensity

We know that, E = Bc

where, B is the magnetic field

Hence on substituting into the formula:

I= cε₀E₀²

⇒ I= c³ε₀B²

Given,

B = 1.30×10⁻¹⁰ T

So,

I = (3 X 10⁸)³ X (8.85 X 10⁻¹²) x(1.10×10⁻¹⁰)²

⇒ I = 96.37 × 10⁻⁸ W/m²

Energy transported per unit hour is :

E= AIt

where A is the area of beam = πr²

             r is the radius of beam used, r = 1.20mm = 0.0012m

            t is the time = 1hr = 3600s

On substituting,

E = 2.891 × 10⁻⁶ × πr² × 3600

E = 2.891 X 10⁻⁶ × 3.14 × (0.0012)² x (3600)

E = 6.40 × 10⁻⁸J

Hence, total energy transported per hour along a narrow cylindrical laser beam is 6.40 × 10⁻⁸J.

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A gas when a fixed mass is compressed into a smaller volume then b) density increases.

Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.

Mass is the measure of object's inertia, more the mass more the inertia. It is a property of material , so it does not change with place. SI unit is 'kg'. It is a scalar quantity.

Volume is a three-dimensional quantity that is used to measure the capacity of a solid shape. It means the amount of three-dimensional space a closed figure can occupy is measured by its volume.

Density = mass / volume

if mass is fixed, then mass = constant

Density will be inversely related to volume

hence , on compression , volume get decreased but mass is constant hence , density will increase

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Answer:

5.06 m/s

Explanation:

velocity = distance / time

             = ( 25.6 - - 14.4) / 7.90 = 5.06 m/s

A hydrogen atom in the n=7 state decays to the n=4 state. The wavelength of the photon that the hydrogen atom emits is 4592.59nm.

The Energy of photon is the energy possessed by a photon when it moves from a high energy level to a low energy level. It emits a photon of a certain wavelength. The following relation can be used to find out the relation between the energy levels and the energy possessed:

E = 13.6 × Z² (1/n₂² - 1/n₁²) eV

where, n₁ is the initial energy level i.e. n₁ =7

            n₂ is the higher energy level i.e. n₂ = 4

            E is the energy possessed

            Z is the atomic number, Z = 1 for H-atom

Subsituting in above equation,

E = 13.6 (1/16 - 1/49) eV

E = 0.27 eV

We know that,

E = hc / λ  

where, h is Planck constant

           c is speed of light

            λ is wavelength

On subsituting,

0.27 eV = 1240/ λ

⇒ λ = 4592.59 nm

Hence, the wavelength of photon emitted by Hydrogen atom is 4592.59nm.

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At high density of the molecules tends to be greater pressure that of molecules and at low density of the molecules tends to be less pressure that of molecules.

It is given that the molecules are in the ideal gas.

It is required to find the greatest effect of the finite size of molecules on the ideal gas law.

According to ideal gas law, at high density of the molecules tends to be greater pressure that of molecules and at low density of the molecules tends to be less pressure that of molecules.

From ideal gas equation,

PV = nRT

Where,

P - Pressure of the molecules

V - Volume of the molecules

n - Total amount of substance

R - Gas constant

T - Temperature of the molecules

As shown from above equation, both the quantities are directly proportional to each other and also ideal gas law follows the kinetic molecular theory  where it suggests that the volume of the molecules have negligible point.

Thus, at high density of the molecules tends to be greater pressure that of molecules and at low density of the molecules tends to be less pressure that of molecules.

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The current flows out of the junction will be Ten Ampere.

To find the answer, we have to know about the Kirchoff's Current Law (KCL).

Thus, we can conclude that the current flows out of the junction will be Ten Ampere.

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If a disk rolls smoothly down a ramp, the acceleration is related to  its angular acceleration in such a way that It is equal to the product of the angular acceleration to the radius of the disk.

Linear acceleration is defined as the uniform acceleration caused by a moving body in a straight line. There are three equations that are important in linear acceleration depending upon the parameters like initial and final velocity, displacement, time and acceleration.

Angular Acceleration is defined as the time rate of change of angular velocity. It is usually expressed in radians per second per second. Thus, α = d ω/ d t. The angular acceleration is also known as rotational acceleration.

Its equal to the product of the angular acceleration to the radius of the disk.

This equation mean that linear acceleration and angular acceleration are directly proportional. The greater the angular acceleration is, the larger the linear (tangential) acceleration is, and vice versa.

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Answer: 150 metres/5 seconds/5 seconds

Explanation:

Find the acceleration/deceleration
v^2 = u^2 + 2as; v=final velocity u=initial velocity a=acceleration s=distance
0^2 = 20^2 + 2*a*50
a = -4 m/s Therefore, the particle is decelerating at 4 m/s
From there, we can work out PQ
Using the same equation, we get that
20^2 = 40^2 + 2*-4*s
s = 150 m so Distance PQ is 150 metres
Finding the time taken to cover PQ and PR uses a different equation
v = u + at; t = time and everything else is the same
20 = 40 - 4t
t = 5 s so Time taken to cover PQ is 5 seconds
0 = 20 - 4t
t = 5 s so Time taken to cover PR is also 5 seconds

17.90 KJ of energy must be added to 69. 0 grams of water to change the temperature from 33°C to 95°C

Specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree. The units of specific heat are usually calories or joules per gram per Celsius degree.

Heat added = H = mc(ΔT )

where,

H = heat

m = mass of water = 69 g

c = specific heat of water = 4.184 J/g/°C

ΔT = change in temperature

H = 69 * 4.184 * ( 95 - 33 )

H   = 17899.152 J

     = 17.90 KJ

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The electronic components are often used to prevent large voltage spikes from being produced when the current flow through an inductor is suddenly terminated is diode.

Inductive fly back refers to the voltage spike created by an inductor when its power supply is suddenly reduced or removed. This voltage spike occurs because the current flowing through the inductor cannot change instantly. The rate at which the current can change is limited by the inductor's time constant.

Diodes are used to protect circuits by limiting the voltage and to also transform AC into DC. Semiconductors like silicon and germanium are used to make the most of the diodes. Even though they transmit current in a single direction, the way with which they transmit differs. There are different kinds of diodes and each type has its own applications.

Voltage spikes occur when the current flow through an inductor stops and the current decreases exponentially. The electronic device "diode" is used to prevent induced voltage spikes because of the current flow in the forward direction and stops the current in the reverse direction.

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117 m/sec is the speed of a transverse wave in a rope of length 3. 1 m and mass 86 g under a tension of 380 n.

The wave speed v is given by

v= √τ/μ

​where τ is the tension in the rope and μ is the linear mass density of the rope.

The linear mass density is the mass per unit length of rope :

μ= m / L = (0.086 kg)/(3.1 m)=0.0277 kg/m.

v= [tex]\sqrt{ \frac{380 N}{0.0277 kg/m}}[/tex]  = 117.125 m/sec (approx. 117 m/sec

In physics, a transverse wave is a wave whose oscillations are perpendicular to the direction of the wave's advance. This is in contrast to a longitudinal wave which travels in the direction of its oscillations. Water waves are an example of transverse wave.

Transverse waves commonly occur in elastic solids due to the shear stress generated; the oscillations in this case are the displacement of the solid particles away from their relaxed position, in directions perpendicular to the propagation of the wave. These displacements correspond to a local shear deformation of the material. Hence a transverse wave of this nature is called a shear wave. Since fluids cannot resist shear forces while at rest, propagation of transverse waves inside the bulk of fluids is not possible.

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A cardiac pacemaker can be affected by a static magnetic field as small as 1. 7 mt. pacemaker wearer comes to a long, straight wire carrying 28 amperes.

A pacemaker is a device that regulates an unsteady heartbeat. A pacemaker is inserted into one or more cardiac chambers using flexible, insulated wires called leads. The electrical pulses needed to change the heart rate are delivered by these lines. Some of the most recent pacemakers don't need leads.

The risk of problems is often quite low while having a pacemaker put. The primary worry is that the pacemaker will no longer be able to regulate the heartbeat due to a malfunction or a wire that has moved out of place. The average patient lived 101.9 months (or 8.5 years) after having a pacemaker implanted; at 5, 10, 15, and 20 years later, 65.6%, 44.8%, 30.8%, and 21.4% of patients were still living, respectively.

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The closest distance peacemaker come to is r=3mm.

Given data:-

B=1.7mt.

I=28A.

by using the equation B=(μ₀I)/2πr

                                     r=μ₀I/2πB

                                     r=[tex]\frac{4\pi *10^{-7} Tm/A *28A}{2\pi (0.0017T)}[/tex]

                                     r=32*[tex]10^{-4}[/tex]m

                                     r=3.2mm.

 thus from the above conclusion we can say that when magnetic field is    1.7mt and current =28A then pacemaker can come close r=3.2mm.

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Extrasolar planet mass can be ten times as that of earth and it's size can be twice as that of earth.

GJ 504b is the planet having lowest mass detected around sun.

HAT-O-67b is the planet having the highest mass with diameter twice as that of Jupiter.

Results show that there are more small planets than the large ones which indicates that small planets are dominant in the galaxy.

Earth-sized planets are common in the galaxy.

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Dr. Berenson's study showed that when obese children reach adulthood they are 8 times more likely to develop high blood pressure than healthy weight children.

Dr. Berenson (September 19, 1922 – November 22, 2018) was an American cardiologist, heart researcher, and public health expert who specialised in determining the root causes of cardiac conditions. According to Dr. Berenson's foundational research, childhood routines and habits are the root cause of adult heart disease. He also found that compared to people with no cardiovascular risk factors, those with three or four cardiovascular risk factors had atherosclerosis that was noticeably more evident. Dr. Berenson began teaching at Tulane University after being released from the U.S. Navy in 1948. He started a two-year research fellowship at the University of Chicago in 1952, where Dr. Berenson worked on rheumatic fever investigations with Albert Dorfman, the department's chief.

According to dr. berenson's study, when obese children reach adulthood, how many times more likely are they have high-blood pressure?

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Answer:

The answer is (d) is totally reflected

Explanation:

Using the total internal reflection concept.

This concept state that:

"If the angle of incidence is greater than the critical angle then the light will not refract but it will reflect back totally"

Using the above statement, as incident angle is 42 degree and critical angle is 41 degree it means incident angle is greater than the critical angle. Therefore, light will not refract but it will totally reflected.

Poor communication

This is an example of a conflict based on poor communication. Because of the reason is that in customer service a person should have skills to communicate in a good manner. It is important because if the person has this skill that he can communicate with others best.

Then he can impress the customer and realize customer about the qualities of their product. In every kind of business, communication skills play major role. Therefore, both john and Henry are confused as their priorities should be on focus to improve their communication skills.

When there is a disconnect between what is said and what is heard, poor communication frequently results. In other words, the individual to whom the communication is being directed misinterprets what you are trying to convey. There is no longer mutual understanding.

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the resistance of the circuit containing 110V and 1.42A current will be 78.57 ohm.

To find the answer, we need to know more about the Ohm's law.

                                      [tex]V[/tex]∝ [tex]I[/tex]

                                    [tex]V=IR[/tex]

where, R is the proportionality constant called resistance of the circuit.

                        [tex]R=\frac{V}{I} =\frac{110}{1.40}=78.57Ohm[/tex]

Thus, we can conclude that, the resistance of the circuit containing 110V and 1.42A current will be 78.57 ohm.

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The angular separation is [tex]4.88 * 10^{-5} rad[/tex]

What is angular distance formula?

The formula is θ=s/r, where, θ is Angular Displacement, s is the distance traveled by the body, and. r is the radius of the circle along which it is moving.

What is meant by angular resolution?

The angular resolving power (or resolution) of a telescope is the smallest angle between close objects that can be seen clearly to be separate. Resolution is limited by the wave nature of light.

The angular separation is calculated as given below.

θ = 1.220 λ/d

Where λ  is the wavelength and d is the diameter of the lens aperture.

θ1 = [tex]1.220 * \frac{600 * 10^{-9} }{1.5 * 10^{-2} }[/tex]

    =  4.88 × [tex]10^{-5}[/tex] rad

Therefore, The angular separation is 4.88 × [tex]10^{-5}[/tex] rad.

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1. The volume of the air is 2500 cm³

2. The pressure in the tyre is 2.27 atm

P₁V₁ = P₂V₂

Where

P₁V₁ = P₂V₂

2.5 × 1000 = 1 × V₂

V₂ = 2500 cm³

Thus, the volume of the air is 2500 cm³

P₁V₁ = P₂V₂

2.5 × 1000 = P₂ × 1100

Divide both sides by 1100

P₂ = (2.5 × 1000) / 1100

P₂ = 2.27 atm

Thus, the pressure in the tyre is 2.27 atm

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The voltage drop across an inductor in a circuit with a dc voltage source at time>> 5*time-constant is more than as compared to first case because the voltage across the inductor is proportional to the rate of change of current which is a maximum at the start when the current and the voltage across the resistor are zero.

As time progresses the current increases at a slower rate as does the voltage across the resistor but the voltage across the inductor decreases.

The voltage drop is proportional to the current, which is the rate-change of the charge. Inductors: V = L (DI/Dt). The voltage drop across the inductor is proportional to the rate-change of the current.

The formula which calculates the inductor voltage is

V= Ldi/dt,

where,

V is the voltage across the inductor,

L is the inductance of the inductor,

di/dt is the derivative of the current flowing across the inductor.

Thus from the above conclusion we can say that The voltage drop across an inductor in a circuit with a dc voltage source at time>> 5*time-constant is more than as compared to first case because the voltage across the inductor is proportional to the rate of change of current which is a maximum at the start when the current and the voltage across the resistor are zero.

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