Answer :
A neutron has mass 1
A positron has mass 0
A beta particle has mass 0
An alpha particle has mass 4
Following that logic, '2. A beta particle has less mass than a neutron' is the correct answer
A positron has mass 0
A beta particle has mass 0
An alpha particle has mass 4
Following that logic, '2. A beta particle has less mass than a neutron' is the correct answer