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Q.

The radioactivity of an element becomes 164th of its original value in 60 sec. Then half life period is

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a

10 sec

b

30 sec

c

5 sec

d

20 sec

answer is B.

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Detailed Solution

use A=A064=A026   so  6 half life period= 60 sec 1 half life= 10 sec.

 

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