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 counts per second, at t=6 seconds is close to
150
200
400
360
A
360
B
150
C
200
D
400
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Solution
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The correct option is C200 At t=0,A0=dNdt=1600C/s at t=8s,A=100C/s AA0=116 in 8sec Therefore half life is t1/2=2sec ∴ Activity at t=6 will be 1600(12)3 =200C/s ∴ correct answer is (3).
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