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A 300 gram radioactive sample has half life of 3 hours. After 18 hours remaining quantity will be :
A
4.68 gram
B
2.34 gram
C
3.34 gram
D
9.37 gram
Detailed Solution
Number of half lives: $n = \dfrac{18}{3} = 6$
Remaining amount $= \dfrac{N_0}{2^n} = \dfrac{300}{2^6} = \dfrac{300}{64}$
$= 4.6875 \approx 4.68$ g
Remaining amount $= \dfrac{N_0}{2^n} = \dfrac{300}{2^6} = \dfrac{300}{64}$
$= 4.6875 \approx 4.68$ g