Using a nuclear counter, the count rate of emitted particles from a radioactive source is measur...

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Using a nuclear counter, the count rate of emitted particles from a radioactive source is measured. At \( t=0 \), it was 1600
\( \mathrm{P} \) counts per second and \( t=8 \mathrm{~s} \), it was 100 counts per second.

W The count rate observed as counts per second at \( t=6 \mathrm{~S} \) is close to
(Main 2019, 10 Jan I)
(a) 400
(b) 200
(c) 150
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