Tag: nuclei

Questions Related to nuclei

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

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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

Which  of the following statement is incorrect for nuclear forces ?

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

  1. These are strongest in magnitude

  2. They are charge dependent

  3. They are effective only for short ranges

  4. They result for interaction of every nucleon with the nearest limited number of nucleons

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Correct Option: B
Explanation:

As we know that nucleus force is a strong force , they are strongest in magnitude. They are short range because the distance between the nucleon $0.7$ fermi which is very small.
They are charged independent. They result for interaction of every nucleon with the nearest limited number of nucleons.

The bin ding energy of deuteron $ (^2 _1H) $ is 1.15 MeV per nucleon and an alpha particle $ ( ^4 _2He ) $ has binding energy of 7.1 MeV per nucleon . then in the reaction $^2 _1H + ^2 _1H \rightarrow ^4 _2He + Q $ the energy Q is

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

  1. 33.0 MeV

  2. 28.4 MeV

  3. 23.8 MeV

  4. 4.6 MeV

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Correct Option: C

A neutron exerts a force on a proton which is

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

  1. gravitational

  2. electromagnetic

  3. nuclear

  4. weak

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Correct Option: A,C
Explanation:

Nuclear force
The nuclear force (or nucleon interaction or residual strong force) is the force of protons and neutrons, subatomic particles that are collectively called nucleons. The nuclear force is responsible for binding protons and neutrons into atomic nuclei. Neutrons and protons are affected by the nuclear force almost identically. Since protons have charge +1 e, they experience a Coulomb repulsion that tends to push them apart, but at short range, the nuclear force is sufficiently attractive as to overcome the electromagnetic repulsive force. The mass of a nucleus is less than the sum total of the individual masses of the protons and neutrons which form it.
Gravitational force
This force acts b.w two particles having non zero mass
Electromagnetic force
Electromagnetism is the study of the electromagnetic force which is a type of physical interaction that occurs between electrically charged particles. 

Since neutron is uncharged, the electromagnetic force is zero.

A proton exerts a force on a proton which is

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

  1. gravitational

  2. electromagnetic

  3. nuclear

  4. weak

Show answer
Correct Option: A,B,C
Explanation:

Nuclear force
The nuclear force (or nucleon interaction or residual strong force) is the force of protons and neutrons, subatomic particles that are collectively called nucleons. The nuclear force is responsible for binding protons and neutrons into atomic nuclei. Neutrons and protons are affected by the nuclear force almost identically. Since protons have charge +1 e, they experience a Coulomb repulsion that tends to push them apart, but at short range the nuclear force is sufficiently attractive as to overcome the electromagnetic repulsive force. The mass of a nucleus is less than the sum total of the individual masses of the protons and neutrons which form it.
Gravitational force
This force acts b.w two particles having non zero mass
Electromagnetic force
Electromagnetism is the study of the electromagnetic force which is a type of physical interaction that occurs between electrically charged particles.

At a specific instant emission of radioactive compound deflected in a magnetic field. The compound can emit 

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

  1. Electrons

  2. Protons

  3. $He^{2+}$

  4. All of these

Show answer
Correct Option: D
Explanation:

Electrons, protons and helium ions are deflected in the magnetic field.

So, the compound can emit electrons protons and $H{e^{2 + }}$.
Hence, Option $A,B,C$ are correct.
so the final answer is D.

Identify the wrong statement in the following Coulomb's law correctly describes the electric force that

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

  1. binds the electrons of an atom to its nucleus.

  2. binds protons and neutrons in the nucleus of an atom.

  3. binds atoms together to form molecules.

  4. binds atoms and molecules to form solids.

Show answer
Correct Option: B
Explanation:

Answer is (B).

As the Coloumb's force applies between two charged bodies and the neutron doesn't have charge.

Protons are placed in a magnetic field in a $Z$ direction (magnitude = 2.3 T). The energy difference between a state with $Z$ component of proton spin angular momentum parallel to the field and antiparallel to the field is 

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

  1. $4.05\times10^{7} eV$

  2. $4.05\times10^{-7} eV$

  3. $2.025\times10^{7} eV$

  4. $2.025\times10^{-7} eV$

Show answer
Correct Option: B
Explanation:

$U _{1}$ = $|S _{z}|$ $B$
=$-2.7928\times(2.3T)\times 3.152\times10^{-8}\left(\displaystyle\ \frac{eV}{T} \right)$
= $-2.025\times10^{-7} eV$ (When $B$ and $|S _{z}|$ are parallel
$U _{2}$ = $+2.025\times10^{-7} eV$ when $B$ and $|S _{z}|$ are antiparallel.
$\therefore$ $\triangle U$ = $U _{2}$ -$U _{1}$ = $4.05\times10^{-7} eV$