A nuclear reaction is given by

${}_Z{X^A} \to {}_{Z + 1}{Y^A} + {}_{ - 1}{e^0} + \bar v$ , represents

  • [AIIMS 2012]
  • A

    fission

  • B

    $\beta  - $ decay

  • C

    $\sigma  - $ decay

  • D

    fusion

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In pair annihilation, an electron and a positron destroy each other to produce gamma radiation. How is the momentum conserved ?

In gamma ray emission from a nucleus

  • [AIEEE 2007]

The composition of an $\alpha $- particle can be expressed as

Which of the following will have highest penetrating power