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Solution


Q.

A free neutron decays into a proton but a free proton does not decay into neutron. This is because             [2023]
1 neutron is an uncharged particle  
2 proton is a charged particle  
3 neutron is a composite particle made of a proton and an electron  
4 neutron has larger rest mass than proton  

Ans.

(4)

As neutron has more rest mass than proton it will require energy to decay proton into neutron.