Tag: physics

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

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

  1. $F _{pp}>F _{pn}= F _{nn}$
  2. $F _{pp}=F _{pn}= F _{nn}$
  3. $F _{pp}>F _{pn}> F _{nn}$
  4. $F _{pp}< F _{pn}= F _{nn}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

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

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

  1. Electrostatic and nuclear

  2. Electrostatic and gravitational

  3. Gravitational and nuclear

  4. Electrostatic
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. nuclear interaction

  2. gravitational interaction

  3. electrostatic interaction

  4. electromagnetic interaction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

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,

  1. $F _{e}= F _{n}$
  2. $F _{e}>> F _{n}$
  3. $F _{e}<< F _{n}$
  4. $F _{n}= F _{e}$
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Gravitational Forces

  2. Electro magnetic Forces

  3. Weak Nuclear Forces

  4. Strong Nuclear Forces
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. Gravitiaonal Forces

  2. Electro magnetic Forces

  3. Weak Nuclear Forces

  4. Strong Nuclear Forces
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Electrostatic force

  2. Nuclear force

  3. Magnetic force

  4. Both (A) and (B)
Reveal answer Fill a bubble to check yourself
D Correct answer
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
Multiple choice physics nuclei nuclear force the nuclear force nuclear force and binding energy

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. 

  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 $12.5eV$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

To excite hydrogen to the n=3 level (12.09 eV), the neutron must provide at least that much energy. The emission of 2.55 eV corresponds to n=4 to n=2 transition. The minimum energy required to reach n=4 is 12.75 eV.