The mass of cesium left afer 120 years if the original mass of cesium is 8640 with an half-life of 30 years, is 540 grams.
<h3>What is half-life?</h3>
This can be defined as the time taken for half the amount of a radioactive substance to decay.
To calculate the amount of cesium left after 120 years, we use the formua below.
Formula:
- R' = R/(
)............. Equation 1
Where:
- R = Original amount of Cesium
- R' = New amount of cesium
- T = Total time
- t = Half-life
From the question,
Given:
- R = 8640
- T = 120 years
- t = 30 years
Substitute these values into equation 1
- R' = 8640/(
) - R' = 8640/
![2^{4}](https://tex.z-dn.net/?f=2%5E%7B4%7D)
- R' = 8640/16
- R' = 540 grams.
Hence, The mass of cesium left afer 120 years is 540 grams.
Learn more about half-life here: brainly.com/question/25750315
First divide the top of the fraction by the bottom, Then <span>multiply the result by 100.
Hope This Is Sufficien!</span>
Area = x (40-2x)
A' = 40 - 4x = 0
x = 10
Dimensions of the pen would be 10 feet by 20 feet
80+80=160+20=180
triangles should always equal 180