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# 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 100200300400

A
300
B
200
C
400
D
100
Solution
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#### In 8 sec count is 100So, 2n=1600100n=4, so in 8 sec there are four half lifes,half life is 2 secIn 6 sec there are 3 half life, count after 6 sec= 160023=200

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