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The initial mass of a radioactive elemen...

The initial mass of a radioactive element is `40g`. How many grams of it would be left after 24 years if its half`-` life period I s of 8 years ? a)2 b)5 c)10 d)20

A

2

B

3

C

10

D

20

Text Solution

Verified by Experts

The correct Answer is:
B
`N= N_0/2^n and n = (24)/(8) = 3 `
`N = (40)/(2^3) = (40)/(8) = 5`
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