Nuclear Physics And Radioactivity Question 359
Question: Certain radio-active substance reduces to 25% of its value in 16 days. Its half-life is [MP PMT 2001]
Options:
A) 32 days
B) 8 days
C) 64 days
D) 28 days
Show Answer
Answer:
Correct Answer: D
Solution:
$ N=N_{0}{{( \frac{1}{2} )}^{\frac{t}{T}}}\Rightarrow \frac{N_{0}}{4}=N_{0}{{( \frac{1}{2} )}^{\frac{16}{T}}} $
$ \Rightarrow T=8 $ days.
BETA
