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Number jof nuclei of radioactive substan...

Number jof nuclei of radioactive substance at time t=0 are 1000 and 9000 at time t=2 s. Then number of nuclie at time t=4 s will be

A

`800`

B

`810`

C

`790`

D

`700`

Text Solution

Verified by Experts

The correct Answer is:
b
In `2` s only `90%` nuceli are left behind. Thus, in next `2 s 90%` of `900` or 810` nuclei will be left.
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