A radioactive decay chain starts from Np93237 and produces Th90229 by successive emissions. The emitted particles can be 
(a) Two α-particles and one β-particle
(b) Three β+ particles
(c) One α particle and two β+ particles
(d) One α particle and two β- particles

(a) By using nα=A-A'4 and nβ=2nα-Z+Z'

Difficulty Level:

  • 60%
  • 15%
  • 25%
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