Quantum Electrodynamics MCQs with Answers

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Quantum Electrodynamics Online Quiz

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• Test Name: Quantum Electrodynamics MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Quantum Electrodynamics

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1 / 40

What is the role of gauge invariance in QED?

Measures particle charge

Describes the shape of the electron

Ensures consistency of the theory

2 / 40

What is the vacuum polarization effect?

Absorption of light by a medium

Creation of real particles from the vacuum

Modification of the vacuum by virtual particles

3 / 40

What is the Euler-Heisenberg Lagrangian?

Kinetic energy of an electron

Potential energy of a proton

Effective Lagrangian for QED at low energies

4 / 40

What is the significance of renormalization in QED?

Simplify classical equations

Increase energy of particles

Remove infinities from calculations

5 / 40

What is the Dirac sea concept?

Sea of positive energy states

Infinite sea of negative energy states

Classical field

6 / 40

What is pair production?

Creation of two photons from an electron

Creation of an electron and positron from a photon

Absorption of a photon by an electron

7 / 40

What is the Lippmann-Schwinger equation used for in QED?

Describes scattering processes

Measures particle decay

Calculates particle mass

8 / 40

What is the role of virtual photons in QED?

Measure particle speed

Describe real particles

Mediate electromagnetic interactions

9 / 40

What is bremsstrahlung?

Interaction between neutrons

Scattering of light by atoms

Radiation emitted by charged particles when decelerated

10 / 40

What is the primary focus of QED?

Interaction of light and matter

Gravitational interactions

Nuclear reactions

11 / 40

What is the fine-structure constant?

The charge of the proton

The mass of the electron

A dimensionless constant characterizing the strength of the electromagnetic interaction

12 / 40

What does the term "asymptotic freedom" mean in QED?

Coupling increases at low energies

Does not apply to QED

Coupling decreases at high energies

13 / 40

What does the term "vertex function" describe in QED?

Shape of the electron orbit

Interaction point in Feynman diagrams

Spin of the photon

14 / 40

What is the primary method for calculating QED processes?

Statistical mechanics

Classical mechanics

Perturbation theory

15 / 40

What does the term "cross section" mean in QED?

Measure of the probability of scattering

Energy of scattered particles

Distance between particles

16 / 40

What is the basic vertex in a QED Feynman diagram?

Photon-photon interaction

Electron-electron interaction

Electron-photon interaction

17 / 40

What is the physical interpretation of a Feynman diagram?

Energy levels of atoms

Position of a particle in space

Space-time evolution of particle interactions

18 / 40

What is the propagator in QED?

A measure of particle spin

A function that describes the probability amplitude for a particle to travel from one point to another

The mass of a particle

19 / 40

What is the primary difference between QED and QCD?

QED deals with gravity

QED deals with electromagnetism, QCD with strong interactions

QED deals with weak interactions

20 / 40

What does the term "self-energy" refer to in QED?

Energy of a particle in motion

Correction to the mass of a particle

Potential energy of an electron

21 / 40

Who introduced the path integral formulation in QED?

Paul Dirac

Richard Feynman

Wolfgang Pauli

22 / 40

What is the Heisenberg uncertainty principle in QED?

Energy is conserved

Speed of light is constant

Position and momentum cannot both be precisely measured

23 / 40

What is Compton scattering?

Scattering of protons by neutrons

Scattering of photons by electrons

Scattering of electrons by neutrons

24 / 40

What particles are primarily involved in QED?

Quarks and gluons

Electrons and photons

Protons and neutrons

25 / 40

What is the fundamental interaction described by QED?

Electromagnetic

Weak nuclear

Strong nuclear

26 / 40

What is the Lamb shift?

Absence of energy levels

Large energy difference

Small difference in energy levels due to QED effects

27 / 40

What is the role of the Ward identity in QED?

Ensures charge conservation

Measures photon polarization

Describes electron spin

28 / 40

What is the Bethe-Heitler process?

Fusion of two nuclei

Pair production in the Coulomb field of a nucleus

Decay of a neutron

29 / 40

What is the role of virtual particles in QED?

Mediate interactions

Always observable

Never appear in calculations

30 / 40

Who is one of the founding fathers of QED?

Isaac Newton

Richard Feynman

Albert Einstein

31 / 40

What equation governs the behavior of the electron in QED?

Maxwell's equations

Schrödinger equation

Dirac equation

32 / 40

What does the term "vertex correction" refer to in QED?

A change in the particle mass

A higher-order correction to the interaction vertex

A type of particle decay

33 / 40

What is the significance of the Coulomb gauge in QED?

Describes magnetic interactions

Measures particle energy

Simplifies the equations of motion

34 / 40

What does the Feynman diagram represent in QED?

Trajectories of planets

Quantum state of atoms

Interaction of particles

35 / 40

What is the main result of the anomalous magnetic moment of the electron?

Exact match with predicted value

No observable effect

Deviation from the predicted value

36 / 40

What is Thomson scattering?

Scattering of electrons by neutrons

Inelastic scattering of photons

Elastic scattering of photons by free electrons

37 / 40

What is the Casimir effect in the context of QED?

Attractive force between uncharged plates due to vacuum fluctuations

Force between charged particles

Magnetic interaction

38 / 40

What is the role of the Lorentz force in QED?

Describes force on a charged particle in an electromagnetic field

Calculates energy levels

Measures particle mass

39 / 40

What does the term "running coupling constant" mean in QED?

Coupling constant is zero

Coupling constant depends on energy scale

Coupling constant is fixed

40 / 40

What is a photon in QED?

Particle with mass

Quantum of the gravitational field

Quantum of the electromagnetic field

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