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The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then

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a
X and Y have the same decay rate initially
b
X and Y decay at the same rate always
c
Y will decay at a faster rate than X
d
X will decay at a faster rate than Y

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detailed solution

Correct option is C

T1/2x=tnnnny⇒0.693λx=1λy⇒λx=0.693λy or λx<λy Also rate of decay = λNInitially number of atoms (N) of both are equal but since λy>λx , therefore, y will decay at a faster rate than x.

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