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The half-life period of a radio-active e...

The half-life period of a radio-active element `X` is same as the mean life time of another radio-active element `Y`. Initially they have the same number of atoms. Then:

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

Text Solution

Verified by Experts

The correct Answer is:
C
`(T_(1//2))_(x)=(tau)_(Y) rArr (0.693)/(lambda_(X)) = 1/(lambda_(Y)) rArr lambda_(Y) gt lambda_(X)` .
So it states that Y will decay faster than X .
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