PGTRB PHY UNIT 8

The tunnelling through a potential barrier increases if

• Hight and width of the barrier increased

• Height and width of the barrier reduced

• Height increased and width reduced of the barrier

• Height reduced and width increased of the barrier

A free particle is said to be that if it is moving in a

• Force free field

• Gravitation field

• Electric field

• Magnetic field

The energy difference between the ground state and first excited state of an electron in one dimensional rigid box of length 1A° is

• 113.5 eV

• 115.0eV

• 150.8eV

• 113.1eV

The product of the uncertainties of a particle can never be smaller than the number of the order

• h cross

• h cross/2

• 3h cross/2

• h cross^2

The Fermi Golden rule obtained using time dependent perturbation theory

• Is time dependent

• Is time independent

• Depends on time harmonically

• Is partially time dependent

The method of partial wave analysis is applicable to

• Long range potential

• Short range potential

• Spherically symmetric potential

• Any type of arbitrary potential

For Hydrogen atom

• The ground state is degenerate

• The excited state are degenerate

• The energy spectrum is discrete and equally spaced

• The excited states are non degenerate

Scattering cross section is maximum when the phase shift is

• Zero

• 45°

• 90°

• 180°

• 0

• 1

• 1/2

• 3/4

• 1

• 2

• 3

• 4