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18 October, 23:10

At noon a radioactive sample decays at a rate of 4,000 counts per minute. at 12:30 pm, the decay rate has decreased to 2,000 counts per minute. the reduced decay rate at 1:30 pm, is

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  1. 18 October, 23:25
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    The decay rate is cut in half each half-hour, so after 1 more hour it will be 1/2*1/2 = 1/4 of the rate at 12:30.

    The reduced decay rate at 1:30 pm is 500 counts per minute.
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