Department of Pre-University Education, Karnataka course PUC Karnataka Science Class 12
Share
Notifications

View all notifications

A Free Neutron Decays to a Proton but a Free Proton Does Not Decay to a Neutron. this is Because - Physics

Login
Create free account


      Forgot password?

Question

A free neutron decays to a proton but a free proton does not decay to a neutron. This is because

  • neutron is a composite particle made of a proton and an electron whereas proton is a fundamental particle

  • neutron is an uncharged particle whereas proton is a charged particle

  • neutron has large rest mass than the proton

  • weak forces can operate in a neutron but not in a proton

Solution

neutron has large rest mass than the proton.

A nucleus is made up of two fundamental particles- neutrons and protons. If a nucleus has more number of neutrons than what is needed to have stability, then neutrons decay into protons and if there's an excess of protons, then they decay to form neutrons. Since a neutron has larger rest mass than a proton, the Q-value of its decay reaction is positive and a free neutron decays to a proton, while an isolated proton cannot decay to a neutron as the Q-value of its decay reaction is negative. Hence, it is physically not possible.

  Is there an error in this question or solution?

APPEARS IN

 HC Verma Solution for Concepts of Physics - Vol. 2 (2018 to Current)
Chapter 24: The Nucleus
MCQ | Q: 3 | Page no. 441
Solution A Free Neutron Decays to a Proton but a Free Proton Does Not Decay to a Neutron. this is Because Concept: Nuclear Energy - Fission.
S
View in app×