A) 30
B) 10
C) 20
D) 15
Correct Answer: C
Solution :
Number of nuclei remaining \[=600450=150\] \[\frac{\text{N}}{{{\text{N}}_{\text{0}}}}={{\left( \frac{1}{2} \right)}^{n}}\] \[\frac{150}{600}={{\left( \frac{1}{2} \right)}^{\frac{t}{{{t}_{1/2}}}}}\] \[{{\left( \frac{1}{2} \right)}^{2}}={{\left( \frac{1}{2} \right)}^{\frac{t}{{{t}_{1/2}}}}}\] \[t=2{{t}_{1/2}}=2\times 10\] =20 minute
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