Nuclear Chemistry Question 2
Question: A radioactive isotope has a $ {t _{1/2}} $ of 10 days. If today 125 gm of it is left, what was its weight 40 days earlier
[EAMCET 1991]
Options:
A) $ 600gm $
B) $ 1000gm $
C) $ 1250gm $
D) $ 2000gm $
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Answer:
Correct Answer: D
Solution:
$ {t _{1/2}}=10days,N=125 $ Calculate as, $ t=\frac{2.303\times {t _{1/2}}}{0.693}\log \frac{N _{o}}{125} $ .
BETA
