The half life period of a radioactive su...

The half life period of a radioactive substance is 10 hours. How much will be left after 4 hours in 1g atom sample ?

A

`45.6 xx 10^(23) ` atoms

B

`4.56 xx 10^(23)` atoms

C

`4.56 xx 10^(24)` atoms

D

`4.56 xx 10^(25)` atoms

Verified by Experts

The correct Answer is:

B

`N_t = N_0 (1/2)^n = 4//10`
`therefore N_t = 6.022xx10^(23) xx (1/2)^(0.4) = 4.56 xx 10^(23)`

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