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Question: A radioactive decay chain starts from \(93Np^{237}\) and produces \(90Th^{229}\) by successive emiss...

A radioactive decay chain starts from 93Np23793Np^{237} and produces 90Th22990Th^{229} by successive emissions. The emitted particles can be.

A

Two α-particles and one β-particle

B

Three β+\beta^{+} particles

C

One α particle and two β+\beta^{+} particles

D

One α particle and two β\beta^{-} particles

Answer

Two α-particles and one β-particle

Explanation

Solution

By using nα=AA4n_{\alpha} = \frac{A - A^{'}}{4} and nβ=2nαZ+Zn_{\beta} = 2n_{\alpha} - Z + Z'