Tag: physics

Questions Related to physics

Let $F _{pp},F _{pn}$ and $F _{nn}$ denote the magnitudes of the nuclear force by a proton on a proton, by a proton on a neutron and by a neutron on a neutron respectively when the separation is less than one Fermi. Then

physics nuclei nuclear force the nuclear force nuclear force and binding energy

  1. $F _{pp}>F _{pn}= F _{nn}$

  2. $F _{pp}=F _{pn}= F _{nn}$

  3. $F _{pp}>F _{pn}> F _{nn}$

  4. $F _{pp}< F _{pn}= F _{nn}$

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Correct Option: B
Explanation:

At separation less than one fermi,  the nuclear force of attraction is strongly active and Nuclear force is charge independent force.

Hence , $F _{pp} = F _{pn} = F _{nn}$

Among the following, short range, charge independent and spin dependent forces are

physics nuclei nuclear force the nuclear force nuclear force and binding energy

  1. Gravitational forces

  2. Nuclear forces

  3. Electromagnetic forces

  4. Weak forces

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Correct Option: B
Explanation:

Nuclear force is short range, charge independent and spin independent force.

Among gravitational,electrostatic and nuclear forces,the two attractive forces between two neutrons are

physics nuclei nuclear force the nuclear force nuclear force and binding energy

  1. Electrostatic and nuclear

  2. Electrostatic and gravitational

  3. Gravitational and nuclear

  4. Electrostatic

Show answer
Correct Option: C
Explanation:

Neutrons have no charge on them. So, there is no electrostatic force. But we have gravitational and nuclear forces on two neutrons because neutrons have masses and gravitational force depends on mass.
So, correct choice is option C.

Among the following interactions, the one of least significance in nuclear physics is

physics nuclei nuclear force the nuclear force nuclear force and binding energy

  1. nuclear interaction

  2. gravitational interaction

  3. electrostatic interaction

  4. electromagnetic interaction

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Correct Option: B
Explanation:

Since, masses of electrons, protons and neutrons are negligible. So, we often neglect gravitational interaction in nuclear physics.

Two protons attract each other when the distance between them is 

physics nuclei nuclear force the nuclear force nuclear force and binding energy

  1. $10^{-18}$m

  2. $10^{-20}$m

  3. $10^{-15}$m

  4. $10^{-22}$m

Show answer
Correct Option: C
Explanation:

Two protons attracts each other when distance between them is less than $10^{-15}m.$

Two protons are kept at a separation of $10$nm. Let $F _{n}$ be the nuclear force and $F _{e}$ be electromagnetic force between them. Then,

physics nuclei nuclear force the nuclear force nuclear force and binding energy

  1. $F _{e}= F _{n}$

  2. $F _{e}>> F _{n}$

  3. $F _{e}<< F _{n}$

  4. $F _{n}= F _{e}$

Show answer
Correct Option: B
Explanation:

At separation greater than fermi, nuclear force is negligible. So, electromagnetic force is much powerful than nuclear force.
So, correct chioce is option B.

Attractive Force exists between two protons inside the Nucleus. This is due to :

physics nuclei nuclear force the nuclear force nuclear force and binding energy

  1. Gravitational Forces

  2. Electro magnetic Forces

  3. Weak Nuclear Forces

  4. Strong Nuclear Forces

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Correct Option: D
Explanation:

The forces that bind fermions (electron, proton, neutron) together are termed as weak forces. Whereas the forces that bind the constituents of a nucleus are strong nuclear force.

Repulsive forces exists between two protons outside the nucleus. This is due to

physics nuclei nuclear force the nuclear force nuclear force and binding energy

  1. Gravitiaonal Forces

  2. Electro magnetic Forces

  3. Weak Nuclear Forces

  4. Strong Nuclear Forces

Show answer
Correct Option: B
Explanation:

Electromagnetic force.

This force is described by electromagnetic fields, and has innumerable physical instances including the interaction of electrically charged particles and the interaction of uncharged magnetic force fields with electrical conductors.

The kind(s) of force that is/are present between two protons in a nucleus is/are _______.

physics nuclei nuclear force the nuclear force nuclear force and binding energy

  1. Electrostatic force

  2. Nuclear force

  3. Magnetic force

  4. Both (A) and (B)

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Correct Option: D
Explanation:
Two protons are subject to two forces;- the nuclear force and the electrostatic force. When they are very close together the nuclear force is dominant, and when they are far apart electrostatic force is dominant
Hence two kinds of forces present between two protons in a nucleus.
However magnitude of Nuclear force is much more than Electrostatic force

A free hydrogen atom in ground state is at rest. A neutron of kinetic energy K collides with the hydrogen atom. After collision hydrogen atom emits two photons in succession one of which has energy $2.55eV$. Assume that the hydrogen atom and neutron has same mas. 

physics nuclei nuclear force the nuclear force nuclear force and binding energy

  1. Minimum value of K is $25.5eV$

  2. Minimum value of K is $12.75eV$

  3. The other photon has energy $10.2eV$

  4. Th upper energy level is of excitation energy $12.5eV$

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Correct Option: A