QM-II wc

The Dirac matrices α_x, α_y, α_z, β are

• Commute

• anti-commute

• Hermitian

• none of the above

The Klein-Gordon relativistic wave equation is applicable to particles of spin

• 0

• 1

• 2

• 1/2

The Compton effect is the scattering of a photon by

• electron

• positron

• neutron

• nucleus

Cross-sections are usually measured in

• barns 

• Tesla

• Electron Volts        

• Fermi

Born approximation is used for scattering of

• Low energy        

• High energy         

• zero energy        

• None of the above

Dirac equation predicts

• the spin angular momentum but not the existence of anti-particles

• both spin angular momentum and existence of anti-particles

• existence of anti-particles but not angular momentum

• none of these

Energy calculated by Variational method is _____ than the exact energy for ground state energy level

• always smaller

• always larger

• equal or Larger

• none of these

Pauli exclusion principle is applicable only for

• (a)   bosons

• (a)   fermions

• Both

• none of these

WKB Approximation applies to any situation in which potential (as function of position) is

• independent of the particle's position
• varies slowly compared to the wavelength of the particle
• varies quickly compared to the wavelength of the particle
• constant throughout the system

The first order correction to the energy for the ground state of a particle in a box due to perturbation λx would be

• ΔE = λ/3
• ΔE = λ
• ΔE = 2λ
• ΔE = λ/2