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An alpha-particle changes into a Helium ...

An `alpha-`particle changes into a Helium atom. In the course of one year the volume of Helium collected from a sample of Radium was found to be `1.12 xx10^(-2)mL` at STP. The number of `alpha` particles emitted by the sample of Radium in the same time is

A

`6xx10^(17)`

B

`3xx10^(17)`

C

`1.5xx10^(17)`

D

`1.2xx10^(18)`

Text Solution

Verified by Experts

The correct Answer is:
B
Vol = `1.12xx10^(-2)ml=(1.12xx10^(-2))/(22400)` moles
`=5xx10^(-7)` moles = `3xx10^(17)` particles
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