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>>Nuclei
>>First Order Radioactive Decay
>> $In the radioactive decay of an element i$

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 be

A

1 minute

B

2 minute

C

3 minute

D

5 minute

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Updated on : 2022-09-05

Solution

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Correct option is C)

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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