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Q.

If a radioactive sample of mass m reduces to m16 in time t, half life of that specimen is

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a

t/4

b

t/2

c

t/8

d

t/3

answer is D.

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Detailed Solution

If x is the no of half life time then 

m=m02x=m016=m024

No.of half live 4

Here

Now t=xT1/2

T1/2=t4

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