7. A neutron at rest decays (breaks apart) into a proton and an electron. Energy is released in the decay, in the form of kinetic energy of the proton and electron. The mass of a proton is 1836 times the mass of an electron. What fraction of the total energy released goes into the kinetic energy of the proton?

The fraction of the total energy goes into kinetic energy of proton is

Explanation:

Given:

Mass of proton

Mass of electron kg

Here neutron at rest decays into proton and electron

     ⇄

Where energy released

The value of this reaction is given by

Where kinetic energy of reaction

Here we need to find fraction of the total energy released goes into the kinetic energy of the proton

Therefore, the fraction of the total energy goes into kinetic energy of proton is

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