Question

what is alpha beta decay ?

Answer 1

Alpha decay is a radioactive decay wherein an atomic nucleus emits an alpha particle and transforms or decays into an atom with a mass number 4 less and atomic number 2 less. It happens when a nucleus with too many protons will decay and produce an alpha particle with two neutrons and two protons.
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Beta decay is a radioactive decay wherein a beta particle like an electron (beta minus) or positron (beta plus) is emitted. It occurs when a nucleus with too many neutrons will decay and turn into an electron, proton, and anti neutrino. The electron which is produced is called beta particle and the process is called beta decay.

Answer 2

alpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle and there by transform into a diff. atomic nucleus.
beta decay forms new element with one more proton and one fewer neutron.