MCQ
Force between the protons and neutrons in a nucleus is:
- AOnly coulombian
- BOnly nuclear
- CBoth (a) and (b)
- DNone of these
✓
Answer
- Only nuclear
Explanation:
CONCEPT:
Strong nuclear force: The strong attractive force which binds together the protons and neutrons in a nucleus is called a strong nuclear force.
- This force cannot be an electrostatic force because positively charged protons strongly repel each other at such a small separation of the order 10-15m.
- This strong nuclear force is the strongest of all the fundamental forces, about 100 times stronger than the electromagnetic force.
Important properties of the strong nuclear force:
- It is the strongest interaction known in nature, which is about 1038 times stronger than the gravitational force.
- It is a short-range force that operates only over the size of the nucleus (= 10-15m).
- It is basically an attractive force but becomes repulsive when the distance between the nucleons becomes less than 0.5 fermi (1 fermi = 10-15m).
- It varies inversely with some higher power (> 2) of distance.
- It is a non-central and non-conservative force.
From the above, it is clear that the force between a neutron and a proton inside the nucleus is only nuclear attractive.
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