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Question

# 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 be1 minute2 minute3 minute5 minute

A
1 minute
B
2 minute
C
3 minute
D
5 minute
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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