1.

A radioactive substance emits n beat particles in the first 2 s and 0.5 n beta particles in the next 2 s. The mean life of the sample is

Answer»

4 s
2 s
`(2)/((1N 2))`
2 (1n 2) s

Solution :We have, `lamda=(0.693)/(T_(1//2)`
Mean life, `TAU=(1)/(lamda)=(t_(1//2))/(0.693)=(2)/(2.303log_(2))=(2)/(IN2)s`


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