If the half-life of iodine-131 is 8. 10 days, how long will it take a 50. 00 g sample to decay to 6. 25 g?
Answer:
24.4684 days
Explanation:
According to the question the given values are :
T(1/2) for iodine-131 is 5.10 days,
[A]₀ for iodine-131 is 50 grams and,
[A] for iodine-131 is 6.25 grams.
T(1/2)=0.693/k
⇒8.10=0.693/k
⇒k=0.865 .
2.303 log [A]₀/[A]= kt
2.303 log(50.00/6.25)= 0.085×t
⇒t=1/0.085×2.303×log8
t=24.4684 days
Hence, the time it will take to decay is 24.4684 days.
Write "W" for Weathering, "E" for erosion, or "D" for deposition for the following examples.
1. Water wearing down rock __
2. Landslides __
3. Waves dropping sand on the beach __
4. Glaciers scraping against rocks __
5. Wind abrasion
6. Sand being moved by wind __
7. Rain washing away soil __
8. Sediment at the bottom of the ocean __
9. Acid rain dissolving limestone __
10. Deltas forming __
Thank you so much. for helping me out with this.
1. Erosion
2. Erosion
3. Deposition
4. Weathering
5. Erosion
6. Deposition
7. weathering
8. Deposition
9. Weathering
10. Deposition
Weathering is the breaking down or dissolving of rocks and minerals on Earths surface. Once a rock has been broken down, a process called erosion transports the bits of rock and minerals away. Water, acids, salt, plants, animals, and changes in temperature are all agents of weathering and erosion
Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water. A similar process, weathering, breaks down or dissolves rock, but does not involve movement.
Deposition is the laying down of sediment carried by wind, flowing water, the sea or ice. Sediment can be transported as pebbles, sand and mud, or as salts dissolved in water. Salts may later be deposited by organic activity (e.g. as sea shells) or by evaporation
(sorry it took a bit of a while, I was doing research)
Please Help T-T
1. The process by which fractures in rocks are enlarged due to plant roots is known as-
A. plant fracturing
B. root wedging
C. plant enlarging
D. none of the above
2. The burning of fossil fuels contributes to which of the following?
A. mechanical weathering
B. lower levels of carbon dioxide
C. acid rain
D. all of the above
3. Which of the following is not an agent of weathering?
A. soil
B. glaciers
C. wind
D. precipitation
4. The breakdown of rock material in its current location is known as-
A. erosion
B. weathering
C. deposition
D. landslide
Thank you so much for your help!
Answer:
1) B. root wedging
2) D. all of the above
3) A. soil
4) B. weathering
:)
Explanation:
A toy train has a mass of 1.5 kg. A force of 3.0 N is acting on the train. What is the acceleration of the train?
a) 0.5 m/s²
b) 4.5 m/s²
c) 2.0 m/s²
d) 1.5 m/s²
Answer: C
Explanation:
Wow, you're in middle school and doing physics? Props to you.
So, for this problem, let's use the formula acceleration = force / mass
Plug in the numbers --
a = (3N) / (1.5kg)
a = 2.0 m/s^2
Hope this helps!!!
MM
Help quick !!!!!!!!!!
You are given a bowl of water and a rubber duck. A wave passes through the bowl of water. How could you determine if a transverse wave passed through the water using the rubber duck? Explain.
If it moved vertically vs horizontally.
Transverse waves go up and down
Longitudinal waves go back and forth
please answer bot of these question (i need a graph)
Match the numbers to the answer below