In the radioactive decay of an element it is found that the count rate reduces from 1024 to 128 in 3 minutes, Its half life will be
1 minute
2 minute
3 minute
5 minute
A
2 minute
B
3 minute
C
5 minute
D
1 minute
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Solution
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128 to 256 is one half
life
256 to 512 is two half
lives
512 to 1024 is 3 half lives.
Divide 3 minutes by
each half life and you get one minute
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