Physics

Nuclear and Atomic Physics

571 Questions

Nuclear and atomic physics explores the components and properties of the nucleus, including isotopes, radioactive decay, and fundamental forces. These concepts are essential for various competitive exams requiring a strong foundation in physics. The provided questions cover structural properties, mass, energy equivalence, and particle interactions.

Nucleus propertiesIsotopes and mass numberAlpha particle scatteringNuclear forcesMass energy equivalenceBeta particle emission

Nuclear and Atomic Physics Questions

Multiple choice

A proton has approximately the same mass as

  1. an electron

  2. a beta particle

  3. an alpha particle

  4. a neutron
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Protons and neutrons are both nucleons and have nearly identical masses, whereas electrons have a much smaller mass.

Multiple choice

When alpha particles are used to bombard gold foil, most of the alpha particles pass through undeflected. This result indicates that most of the volume of a gold atom consists of ______________.

  1. unoccupied space

  2. protons

  3. neutrons

  4. deuterons
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Rutherford gold foil experiment showed that most alpha particles passed through undeflected, leading to the conclusion that the atom is mostly empty space with a small, dense, positively charged nucleus.

Multiple choice

In beta minus emission, the number of nucleons in the atom:

  1. remains the same

  2. increases by four

  3. decreases by one

  4. decreases by one
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In beta minus emission, a neutron converts to a proton, emitting an electron and antineutrino. The number of nucleons (protons + neutrons = mass number) remains unchanged because one neutron becomes one proton - total count stays the same.

Multiple choice

The atom's nucleus is held together by which of the following:

  1. strong interactions of the lepton and gluon constituents of the atom's nucleus

  2. weak interactions of the quark and lepton constituents of the atom's nucleus

  3. strong interactions of the quark and lepton constituents of the atom's nucleus

  4. strong interactions of the quark and gluon constituents of the atom's nucleus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The strong nuclear force holds the nucleus together. This force acts between quarks, which are mediated by gluons.

Multiple choice

A proton has approximately the same mass as

  1. an electron.

  2. a beta particle.

  3. an alpha particle.

  4. a neutron.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Protons and neutrons are both nucleons and have nearly identical masses, approximately 1 atomic mass unit (amu). Electrons have a much smaller mass, about 1/1836 of a proton.

Multiple choice

The atom's nucleus is held together by which of the following:

  1. strong interactions of the lepton and gluon constituents of the atom's nucleus

  2. weak interactions of the quark and lepton constituents of the atom's nucleus

  3. strong interactions of the quark and lepton constituents of the atom's nucleus

  4. strong interactions of the quark and gluon constituents of the atom's nucleus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The atomic nucleus is held together by the strong nuclear force, which acts between quarks mediated by gluons.

Multiple choice

When alpha particles are used to bombard gold foil, most of the alpha particles pass through undeflected. This result indicates that most of the volume of a gold atom consists of _____________________.

  1. unoccupied space

  2. protons

  3. neutrons

  4. deuterons
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Rutherford gold foil experiment showed that most alpha particles passed through, leading to the conclusion that the atom is mostly empty space with a small, dense, positively charged nucleus.

Multiple choice

In beta minus emission, the number of nucleons in the atom:

  1. remains the same

  2. increases by four

  3. decreases by one

  4. decreases by four
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In beta minus decay, a neutron turns into a proton and an electron (and an antineutrino). The total number of nucleons (protons + neutrons) remains constant.

Multiple choice

Which one of the following is not a sub atomic particle?

  1. Neutron

  2. Proton

  3. Deuteron

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

Neutrons, protons, and electrons are the fundamental subatomic particles. A deuteron is a nucleus consisting of one proton and one neutron, making it a composite particle, not a fundamental subatomic particle.

Multiple choice

An alpha particle is nothing but a / an

  1. helium

  2. electron

  3. photon

  4. neutron
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The alpha particle is the heaviest. It is produced when the heaviest elements decay. Alpha and beta rays are not waves. They are high-energy particles that are expelled from unstable nuclei. In the case of alpha radiation, the energy of the particles leave the nucleus . An alpha particle is an helium atom and contains two neutrons and two protons. It leaves the nucleus of an unstable atom at a speed of 16,000 kilometres per second.

Multiple choice

A particle accelerator can not increase the kinetic energy of:

  1. positron

  2. alpha particles

  3. neutrons

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

Only charged particles can have their kinetic energy increased in a particle accelerator. Electric and magnetic fields are used to speed up the particles and these field have no effect on uncharged particles. Neutrons have no charge so a particle accelerator can not increase the kinetic enegy of a neutron.

Multiple choice

The isotopes of an element differ in

  1. the charge on the nucleus

  2. the number of neutrons in the nucleus

  3. the number of extra nuclear electrons

  4. both the nuclear charge and the number of extra nuclear electrons
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes. For example, the most common isotope of hydrogen has no neutrons at all; there's also a hydrogen isotope called deuterium, with one neutron, and another, tritium, with two neutrons.

Multiple choice

The addition of a neutron to the nucleus of an atom results in the

  1. formation of an isobar

  2. formation of an isotope

  3. formation of an isotone

  4. increase in mass number and atomic number
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Atoms of the same element can have different numbers of neutrons; the different possible versions of each element are called isotopes. For example, the most common isotope of hydrogen has no neutrons at all; there's also a hydrogen isotope called deuterium, with one neutron, and another, tritium, with two neutrons. The addition of a neutron to the nucleus of an atom results in the formation of an isotope.