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# 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 to150200400360

A
360
B
150
C
200
D
400
Solution
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#### The correct option is C200At t=0,A0=dNdt=1600 C/sat t=8s,A=100 C/sAA0=116 in 8 secTherefore half life is t1/2=2 sec∴ Activity at t=6 will be 1600(12)3=200 C/s∴ correct answer is (3).

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