Physics

Nuclear and Atomic Physics

576 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

What did Rutherford conclude about the atom as a result of his Gold Foil experiment?

  1. The atom is composed of mainly empty space.

  2. The atom is a densely packed substance.

  3. Electrons float in a positively charged substance.

  4. Protons are positively charged.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Because the vast majority of alpha particles passed straight through the gold foil without deflection, Rutherford concluded that the atom consists mostly of empty space, with a tiny, dense, positively charged nucleus at its center.

Multiple choice

Which particle has a positive charge?

  1. protons

  2. neutrons

  3. electrons

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

Protons are positively charged subatomic particles found in the nucleus of an atom. Neutrons have no charge, and electrons have a negative charge.

Multiple choice

What 2 particles are found in the nucleus of an atom?

  1. protons and neutrons

  2. electrons & neutrons

  3. electrons and protons

  4. protons and klingons
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The nucleus of an atom is composed of protons and neutrons, which are collectively called nucleons. Electrons orbit outside the nucleus in the electron cloud.

Multiple choice

Which atoms are positive?

  1. Protons

  2. Neutrons

  3. Electrons

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

Protons are subatomic particles that carry a positive electric charge. In contrast, electrons carry a negative charge, and neutrons are electrically neutral.

Multiple choice

The center of an atom; it contains protons and neutrons.

  1. Atomic Nucleus

  2. Atomic Number

  3. Electron Cloud

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

The atomic nucleus is the dense central region of an atom consisting of protons and neutrons. Other options refer to properties of the atom or the surrounding electron region.

Multiple choice

atoms are made of

  1. electron

  2. neutron

  3. proton

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Atoms are composed of three main subatomic particles: protons, neutrons, and electrons. Therefore, all of these are components of an atom.

Multiple choice potential energy of a system of charges potential energy of various configurations electrostatic potential and capacitance electrostatics physics

A proton and a deuteron are initialy at rest an dare accelerated through the same potential difference. Which following is false concerning  the final properties of the two particles?

  1. They have different speeds

  2. They have same momentum

  3. They have same kinetic energy

  4. They have been subjected to same force
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Kinetic energy gained is q * V. Since both particles have the same charge q and are accelerated through the same potential V, they gain the same kinetic energy. Therefore, the statement that they have different kinetic energies is false.

Multiple choice physics static electricity properties of charges charge properties of charge

The energy of thermal neutrons is

  1. $< 1 \mathrm { ev }$
  2. $> 1 \mathrm { ev }$
  3. $= 2 \mathrm { Mev }$
  4. $= 4 \mathrm { Mev }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thermal neutrons are neutrons that are in thermal equilibrium with their surroundings, typically having kinetic energies around 0.025 eV, which is well below 1 eV.

Multiple choice

What is the primary mechanism responsible for the formation of elements heavier than iron in stars?

  1. Nuclear Fusion

  2. Electron Capture

  3. Neutron Capture

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

Neutron capture, a process where neutrons are absorbed by atomic nuclei, is the main mechanism for the formation of elements heavier than iron in stars.