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How many alpha-particles are emitted in ...

How many `alpha`-particles are emitted in the nuclear transformation: `""_(84)Po^(215)to""_(82)Pb^(211)+?""_(2)He^(4)`

A

0

B

1

C

2

D

3

Text Solution

Verified by Experts

The correct Answer is:
B
Let x `alpha`-particles are emitted.
`""_(84)Po^(215)to""_(82)Pb^(211)+x""_(2)He^(4)`
Equating atomic mass of both sides
`215=211+4x`
`therefore" "x=(215-211)/(4)=(4)/(4)=1`
Therefore, one `alpha`-particle is emitted.
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