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How many alpha-particles are emitted in ...

How many `alpha`-particles are emitted in the nuclear transformation: `._(84)Po^(215) rarr ._(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) rarr ._(82)Pb^(211) + x ._(2)He^(4)`
Equating atomic mass of the both sides
`215 = 211 + 4x`
`:. X = (215 - 211)/(4) = (4)/(4) = 1`
Therefore, one `alpha`-particle is emitted.
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