Q.

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

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away
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)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

λe=130+160=120 Now N=N0e-λet =N04=N0e-t20        ⇒t=27.72 yrs
Watch 3-min video & get full concept clarity
score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon