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

An alpha-particle changes into a Helium atom. In the course of one yea

1.	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
Answer» `6XX 10^(17)` `3 xx 10^(17)` `1.5 xx 10^(17)` `1.2 xx 10^(18)` Answer :B