Q.

Activity of a sample of a radio active material A1, at a time t1 and   A2 at a time  t2. If mean life is T then

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a

A1t1=A2t2

b

T=A2-A1t2-t1

c

A1A2=et2-t1T

d

A2=A1t1Tt2

answer is C.

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Detailed Solution

A1=λN0e-λt1   and A2 =λN0e-λt2dividing A1A2=e-λt1e-λt2=et2-t1λ=et2-t1T  T=1λ
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Activity of a sample of a radio active material A1, at a time t1 and   A2 at a time  t2. If mean life is T then