A) electromagnetic waves
B) fast moving electrons
C) singly ionised gas atoms
D) helium nuclei
Correct Answer: B
Solution :
Using the relation, Here, \[n=\frac{t}{T}=\frac{10}{5}\] Initial atoms \[=\text{ }50000\] So, \[n={{\left( \frac{1}{2} \right)}^{10/5}}\times 50000=\frac{1}{4}\times 50000=12500\]
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