Q136 / 160 · TS EAMCET 2017 · Physics

Which of the following is emitted, when ${ }_{94}^{239}$ Pu decays into ${ }_{92}^{235} \mathrm{U}$ ?

  • A
    Gamma ray
  • B
    Neutron
  • C
    Electron
  • Correct answer
    D
    Alpha particle

Solution

${ }_{94}^{239} \mathrm{Pu} \stackrel{\alpha}{\longrightarrow}{ }_{92}^{235} \mathrm{U}$ When $\alpha$ particle is emitted that atomic mass is decreases by four and atomic number is decreases by two.

Hence, the correct answer is option: 'D'.

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