Question

a sample contains 24 g of radioactive isotope. how much radioactive isotope remains in the sample after 2 half-lives?
A. 6 g
B. 1.5 g
C. 12 g
D 3 g

Answer 1

Answer:

6

Explanation:

2 half life

divide by 2 twice

24/2=12

12/2=6

A. 6

Answer 2

This question involves the concepts of half life and radioactive isotopes.

The amount of the radioactive isotope that remains after 2 half-lives is "6 g".

Half-Life

Half-life of a radioactive isotope is the time in which half of the sample is vanished. Remaining sample after "n" number of half-lives can be given by the following formula:

$m=\frac{m_o}{2^n}$

where,

• m = remaining mass of the sample = ?
• m₀ = initial sample = 24 g
• n = no. of half-lives = 2

Therefore,

$m=\frac{24\ g}{2^2}$

m = 6 g

Learn more about half-life here:

https://brainly.com/question/24710827

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