Tag: nuclei

Quizzes (7) Questions (160)

Questions Related to nuclei

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.

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

Which  of the following statement is incorrect for nuclear forces ?

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. 33.0 MeV

  2. 28.4 MeV

  3. 23.8 MeV

  4. 4.6 MeV
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Q = (BE of products) - (BE of reactants). Reactants: 2 * (2 * 1.15) = 4.6 MeV. Products: 4 * 7.1 = 28.4 MeV. Q = 28.4 - 4.6 = 23.8 MeV.

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

A neutron exerts a force on a proton which is

  1. gravitational

  2. electromagnetic

  3. nuclear

  4. weak
Reveal answer Fill a bubble to check yourself
A,C Correct answer
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.

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

A proton exerts a force on a proton which is

  1. gravitational

  2. electromagnetic

  3. nuclear

  4. weak
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
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.

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

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

  1. Electrons

  2. Protons
  3. $He^{2+}$

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

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

Answer is (B).

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

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

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 

  1. $4.05\times10^{7} eV$
  2. $4.05\times10^{-7} eV$
  3. $2.025\times10^{7} eV$
  4. $2.025\times10^{-7} eV$
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
$\therefore$ $\triangle U$ = $U _{2}$ -$U _{1}$ = $4.05\times10^{-7} eV$