Questions
A radioactive nucleus can decay by two different processes. The mean value period for the First process is and that for the second process is . The effective mean value period for the two processes is:
detailed solution
Correct option is D
Let the decay constants for the first and second processes be λ1 and λ2 and the effective decay constant for the combined process be λ . Then λ1=loge2t1 and λ2=loge2t2 and λ=loge2tNow, the probability for decay through first process in a small time interval dt is λ1 dt and the probability for decay through second process in the same time interval dt is λ2 dtThe probability for decay by the combined process in the same time interval dt is λ1 dt+λ2 dt.But this is also equal to λ dt∴λ dt=λ1 dt+λ2 dt ∴λ =λ1+λ2 or loge2t=loge2t1+loge2t2or 1t=1t1+1t2 or t=t1t1t1+t2Similar Questions
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
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests