## Quantum Mechanics MCQs | MSc Physics

**Quantum Mechanics MCQs** | MSc Physics: Here you will learn the MCQs of quantum mechanics of all chapters and topics with complete concepts and solutions. Here following chapters will cover the Origins of quantum physics MCQs. Mathematical tools of quantum physics MCQs. Postulates of quantum physics MCQs. One-Dimensional problems MCQs. Angular momentum MCQs. Three-Dimensional problems MCQs. Rotation and addition of angular momenta MCQs. Identical particles MCQs. Time-Dependent Perturbation theory MCQs. Approximation methods for stationary states. Scattering theory MCQs, etc.

# The angular momentum of the earth is about 10^{23} kg-m^{2}/sec. Approximately what is the angular momentum quantum number of the earth in its orbit around the sun? (h/2π ≈ 10 joules-sec)

# The ground state energy of an anisotropic harmonic oscillator described by the potential

# The energy of an electron of de-Broglie wavelength 1Å in eV will be

**150.5**- 13.6
- 10.2
- 1.227

# The Compton wavelength of an electron (mc^{2} = 0.511 MeV) is of the order of

**10**^{-2 }Å- 1 Å
- 10 Å
- 10
^{2 }Å

# In order to produce an electron ( e^{–} ) and positron ( e^{+} ) pair in a collision with an electron at rest having mass M, the photon has minimum energy that is

- 4Mc
^{2} - 3Mc
^{2} **2Mc**^{2}- Mc
^{2}

# Consider the motion of a relativistic particle of mass m, momentum p, and energy E, Find the group velocity

**pc**^{2}/E- E/p
- p
^{2}c^{2}/E - pc/E
- zero

# Consider a matrix, The trace of this matrix is equal to

- 1
- 3
- 0
- undefined

# The eigenvalues of the matrix A = are

- real and distinct
**complex and distinct**- complex and coinciding
- real and coinciding

# The eigenvalue of a matrix are ι, 2ι and 3ι. The matrix is:

- Unitary
- Anti-unitary
- Hermitian
**Anti-hermitian**