1.

The half-life period of a radioactive element X is same as mean life of another radioactive element Y. Initially they have same no. of atoms, then:

Answer»

Y decays faster than X
X and Y DECAY EQUALLY initially
X and Y decay at same rate always
X will decay faster than Y.

Solution :`T_(X)=(0.693)/(lambda X)`
`T_(Y)=1/(lambda_(Y))=(0.693)/(lambda_(Y)) xx (1)/(0.693) =(T_(Y))/(0.693)`
`T_(X)=(T_(Y))/(0.693) RARR T_(X) gt T_(Y)`
Y decays faster than X.


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