Question

Assertion: Nuclear forces are called short range forces.
Reason: Nuclear forces operate over very small distance i.e., 10⁻¹⁵ m or 1 fermi.
(A) If both assertion and reason are true and the reason is the correct explanation of the assertion
(B) If both assertion and reason are true but reason is not the correct explanation of the assertion
(C) If assertion is true but reason is false
(D) If the assertion and reason both are false

Answer 1

Hint :The nuclear force is one of nature's four basic forces, along with gravitational and electromagnetic forces. They are also known as the heavy forces because they are 10 million times stronger than chemical binding forces. The nuclear force is the interaction between protons and neutrons in atoms.

Complete Step By Step Answer:
The nuclear force is one of nature's four basic forces, along with gravitational and electromagnetic forces. They are also known as the heavy forces because they are 10 million times stronger than chemical binding forces. The nuclear force is the interaction between protons and neutrons in atoms.
The nuclear force is the interaction between protons and neutrons in atoms. The nuclear force affects neutrons and protons, all nucleons, in almost identical ways. Since protons have a charge of +1 e, they are subjected to an electric force that appears to drive them apart, but the attractive nuclear force is strong enough to counteract this force at short distances. The nuclear force is what holds nucleons together in atomic nuclei.
At distances of about 1 femtometre, the nuclear force is powerfully attractive between nucleons, but it quickly fades to insignificance at distances beyond 2.5 fm. The nuclear force becomes repellent at distances of less than 0.7 fm. Since nucleons can only come closer than the force allows, this repulsive component is responsible for the physical size of nuclei. In addition, the size of an atom is five orders of magnitude greater, calculated in angstroms. The nuclear force, on the other hand, is not straightforward since it is dependent on nucleon spins, has a tensor component, and may be affected by nucleon relative momentum.
Hence, option A is correct.

Note :
The nuclear force is one of nature's four basic forces, along with gravitational and electromagnetic forces. They are also known as the heavy forces because they are 10 million times stronger than chemical binding forces. The nuclear force is the interaction between protons and neutrons in atoms.