A count rate meter shows a count of 240 per minute from a given radioactive source. One hour lat...

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A count rate meter shows a count of 240 per minute from a given radioactive source. One hour later the meter shows a count rate of 30 per minute. The half-life of the source is
(A) \( 120 \mathrm{~min} \)
(B) \( 80 \mathrm{~min} \)
(C) \( 30 \mathrm{~min} \)
(D) \( 20 \mathrm{~min} \)
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