Question $1(1$ point$)$

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In gamma radiation which of the following is correct:

a new nucleus forms with a mass number that is decreased by $4$ and an atomic number that is decreased by $2.$

high$-$energy radiation is absorbed from the nucleus when it decays

energy is emitted from an unstable nucleus and the mass number and the atomic number of the new nucleus are the same.

a neutron in the nucleus breaks down to form a proton and a beta particle, increasing the atomic number by $1.$