The mean lives of a radioactive sample are 30 years and 60 years for α-emission and β- emission respectively. If the sample decays both by α-emission and β-emissionsimultaneously, the time after which, only one-fourth of the sample remain is
see full answer
High-Paying Jobs That Even AI Can’t Replace — Through JEE/NEET
🎯 Hear from the experts why preparing for JEE/NEET today sets you up for future-proof, high-income careers tomorrow.
An Intiative by Sri Chaitanya
a
32.45 years
b
20 years
c
27.72 years
d
45 years
answer is C.
(Unlock A.I Detailed Solution for FREE)
Best Courses for You
JEE
NEET
Foundation JEE
Foundation NEET
CBSE
Detailed Solution
λe=130+160=120 Now N=N0e-λet =N04=N0e-t20 ⇒t=27.72 yrs