A certain sample of a radioactive materi...

A certain sample of a radioactive material decays at the rate of 500 per second at a certain time. The count rate falls to 200 per second after 50 minutes.
(a) What is the decay constant of the sample ?
(b) What is its half-life?

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The correct Answer is:

(a) `3.05 xx10^(-4) s; ` (b) 38 min

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A certain sample of a radioactive material decays at the rate of 500 per second at a certain time. The count rate falls to 200 per second after 50 minutes. (a) What is the decay constant of the sample ? (b) What is its half-life?

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A certain sample of a radioactive material decays at the rate of 500 per second at a certain time. The count rate falls to 200 per second after 50 minutes.
(a) What is the decay constant of the sample ?
(b) What is its half-life?