The reason for difference in the energy of the emitted electron or positron in the beta decay lies in a large range of frequencies, and energy of emitted alpha particle in the alpha decay have only discrete values.

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Chapter 30, Problem 2CQ

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The reason for difference in the energy of the emitted electron or positron in the beta decay lies in a large range of frequencies, and energy of emitted alpha particle in the alpha decay have only discrete values.

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