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Standard XII
Physics
Alpha Decay
Question

22Ne nucleus, after absorbing energy, decays into two α-particles and an unknown nucleus. The unknown nucleus is
  1. carbon
  2. boron
  3. oxygen
  4. nitrogen

A
oxygen
B
nitrogen
C
boron
D
carbon
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Solution
Verified by Toppr

22Ne decays
α particle = He2+
Mass No = 4
p=2,n=2
So, New mass no. =22−8=14
Atomic No. =10−4=6
So, the new element is 6C14

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