Which statement about radioactive decay is correct?
1 )
Neutrinos are always emitted during $\alpha$-decay.
2 )
The $\alpha$-particles emitted from a radioactive sample have a continuous range of kinetic energies.
The $\beta^{-}$ particles emitted from a radioactive sample have a continuous range of kinetic energies.
4 )
The proton number of a nucleus decreases by four when it undergoes $\alpha$-decay.
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