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The half-life of a radioisotope is 1.5 h...

The half-life of a radioisotope is 1.5 hours. If its initial mass is 32g, the mass left undecayed after 6 hours is

A

32 g

B

16 g

C

4 g

D

2g

Text Solution

Verified by Experts

The correct Answer is:
D
`N="mass left" =(N_(0)("initial mass"))/(2^(t)//^(t)_(1//2)`
`N=32//2^(4)("since "t//_(t_(1//2))=6//_(1.5)=4)=2g`
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