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 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.
answer is C.
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Detailed Solution
0.693λX=1λY⇒λY>λXSince, −dNdtX=λXNAnd −dNdtY=λYN⇒−dNdtY>−dNdtXDecay rate of Y > Decay rate of X.