Physics · 2010
NEET 2010 · Prelims · Code A · Q42
The activity of a radioactive sample is measured as N_0 counts per minute at t =0 and N_0 / e counts per minute at t =5 minutes. The time (in…
The activity of a radioactive sample is measured as $\displaystyle \mathrm{N}_0$ counts per minute at $\displaystyle \mathrm{t}=0$ and $\displaystyle \mathrm{N}_0 / \mathrm{e}$ counts per minute at $\displaystyle \mathrm{t}=5$ minutes. The time (in minutes) at which the activity reduces to half its value is :
Official answer
(1)
$\displaystyle 5 \log _e 2$
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NEET (UG) 2010 Physics question, with the answer from NTA’s final answer key. Where our answers come from.