The counting rate of disintegration of radioactive source at t=0 second was 1600 counts per second and at t=8 seconds was 100 counts per second. The counting rate observed as counts per seconds, at t=6 second would have been

100

200

300

400

A

300

B

200

C

400

D

100

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Solution

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In 8sec count is 100

So, 2n=1600100

n=4, so in 8 sec there are four half lifes,half life is 2sec

In 6sec there are 3 half life, count after 6sec=160023=200

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