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A radioiostope X has a half-life of 10 s...

A radioiostope `X` has a half-life of `10 s`. Find the number of nuclei in the sample (if initially there are `1000` isotopes which are falling from rest from a height of `3000 m` ) when it is at a height of `1000 m` from refrence plane.

A

`50`

B

2`50`

C

`29`

D

`100`

Text Solution

Verified by Experts

The correct Answer is:
b
Calculate time when it reaches a height of 1000 m, then use `A=lambda N`.
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