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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 to : 

(1) 150 

(2) 360 

(3) 200 

(4) 400

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Correct option: (3) 200


till t = 6 sec. 3 half lives must have been completed. So count rate = 1600/23 = 200

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