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Question

A nuclide A undergoes α decay and another nuclide B undergoes βdecay.

A
All the α particles emitted by A will have almost the same speed.
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B
All the α particles emitted by A may have widely different speeds.
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C
All the β particles emitted by B will have almost the same speed.
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D
All the β particles emitted by B may have widely different speeds.
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Solution

The correct option is D All the β particles emitted by B may have widely different speeds.
In α decay, only α particle is emitted, so the entire energy is carried away by the alpha particle as its Kinetic energy.

Therefore, all α particles have same speed.

In β decay, β particle and anti-neutrino are emitted, so the energy is shared between the β-particle and anti-neutrino.

Therefore, the speed of β particle will vary depending on the energy of the anti-neutrino.

Hence, options (A) and (D) are correct.

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