Tag: physics

Questions Related to physics

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

Show answer
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

Show answer
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.
$\therefore$ $\triangle U$ = $U _{2}$ -$U _{1}$ = $4.05\times10^{-7} eV$

Two Nucleons are at a separation of $1$ fermi. Proton have a charge $1.6\times10^{-19}$ $C$, the nuclear force between them is $F _{1}$ both are neutrons, $F _{2}$ if both are protons, $F _{3}$ if one neutron and one proton then

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

  1. $F _{1}$ = $F _{2}$>$F _{3}$

  2. $F _{1}$ = $F _{2}$ = $F _{3}$

  3. $F _{1}$<$F _{2}$<$F _{3}$

  4. $F _{1}$ = $F _{2}$<$F _{3}$

Show answer
Correct Option: B
Explanation:

Nuclear force is independent of charge of the nucleons.

Thus nuclear force is same for any pair of two nucleons which are at same distance apart.
$\therefore        F _1 = F _2 = F _3$

Nuclear force exist between

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

  1. Proton - Proton

  2. Proton - Neutron

  3. Neutron - Neutron

  4. All of the above

Show answer
Correct Option: D
Explanation:

All of the above.

Nuclear force exist between
Proton- Proton
Proton- Neutron
Neutron- Neutron
As Neutrons and Protons both are nucleons

Two nucleons are at a separation of $1$ fermi. The net force between them is $F _{1}$, if both are neutrons, $F _{2}$ if both are protons and $F _{3}$, if one is a proton and the other is a neutron

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

  1. $F _{1} > F _{2} > F _{3}$

  2. $F _{2} > F _{1} > F _{3}$

  3. $F _{1} = F _{3} > F _{2}$

  4. $F _{1} = F _{2} > F _{3}$

Show answer
Correct Option: C
Explanation:

Nuclear forces are the strongest forces in nature.
Nuclear forces are the strong forces of attraction which hold together the nucleons (neutrons and protons) in the tiny nucleus of an atom, inspite of strong electrostatic forces of repulsion between protons. Nuclear forces act between a pair of neutrons, a pair of protons and also between a neutron, proton pair with the same strength. This shows that nuclear forces are independent of charge.
The attractive nuclear force is the same for any pair of nucleons. Thus, $F _{1} = F _{3}$ when there are no electrostatic forces, but
$F _{2} =$ attractive nuclear force $-$ repulsive electrostatic force
Hence, $F _{1} = F _{3} > F _{2}$