The rate at which electrons are emitted from the surface is proportional to the freqency of the radiation

hv=A+Ek photoeffect equation (Enshtein

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The nuclear force is very weak and much smaller in relative magnitude than the
electrostatic and gravitational forces

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There is no change in either the number of neutrons or the number of protons

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Proton number unchanged and nucleon number increases by 1

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