Physics Middle School

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?

Answers

Answer 1

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.

Related Questions

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.

Answers

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)

1. E
2.w
3.D
4.w
5.e
6.w
7.w
8.e
9.e
10.d

please answer bot of these question (i need a graph)

Answers

I don’t know I’m super sorry hun
The freezing point of salol is 41.5 degrees Celsius (106.7 Fahrenheit). Salol or phenyl salicylate is a chemical compound with the formula C13H10O3. It is often used as an ingredient in the making of sunscreens because it can absorb UV light

can someone please help me?

Answers

Answer:

I believe the answer is C

Explanation:

C, I used process of elimination.

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!

Answers

Answer:

1) B. root wedging

2) D. all of the above

3) A. soil

4) B. weathering

:)

Explanation:

1. Root wedging
2. Lower levels of carbon dioxide
3.Glaciers
4.Erosion

answer question 2 please

Answers

Answer: The greater the temperature difference the greater the rate at which transfers

Which of the following are not examples of mechanical energy? There is more than one answer.

Question 1 options:

running


heat


photosynthesis


hands on a clock moving


a spinning top


nuclear fission

Answers

it should be photosynthesis :)

Answer:

running+photosynthesis

e Card A: What is the effect of magnetic
angement on magnetic force?
Experiment Results
✪
sensor reading:
1.4 mT
sensor reading:
4.3 mT
J
sensor reading:
8.1 mT
Evidence Card C: What is the effect of rail
material on the kinetic energy of the car?
Experiment Results
Test 1
Test 2
Test 3
Rail material
wood
aluminum
iron
Distance
between car
and launcher
10 cm
10 cm
10 cm
Kinetic energy
after the car
was launched
3.1kJ
2.9 kJ
2.2kJ

Answers

Answer:

Explanation:

                             

A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby has a mass of 1. 5 kg. The carriage has potential energy. Calculate it

Answers

Answer:

Height (h) = 21 m

Weight (W) = 12 N

The Gravitational Potential Energy is 252 J.

Explanation:

H (21) m
W (12) n



Hopefully this helps

Match the numbers to the answer below

Answers

1. Stationary front
2. Isobar
3. Cold Front
4. Air mass
5. Weather maps
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