Using a nuclear counter the count rate of emitted particles from a radioactive source is measured. At t = 0 it was 1600 counts per second and t = 8 seconds it was 100 counts per second. The count rate observed, as

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Correct answer: B. 200

After 8 seconds count rate changes from A _ 1 = 1600 per second to A _ 2 = 100 per second. A _ 2 = A _ 1 16 = A _ 1 2 ^ 4 ∴ 8s in 4 half life ⇒ 1 half life = 2s t = 6s is 3 half life. ∴ Count rate after 3 second A = A _ 1 2 ^ 3 = (1600)/(8) = 200

Using a nuclear counter the count rate of emitted particles from a...

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