Atomic and Molecular Physics [GATE (Graduate Aptitude Test in Engineering) Physics (PE)]: Questions 31 - 34 of 109

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Question 31

Appeared in Year: 2013

Question MCQ▾

Consider the scattering of neutron by photons at very low energy due to a nuclear potential of range . Given that,

Where, is the phase shift, the wave number and the logarithmic deviation of the deuteron ground state wave function, the phase shift is –

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 32

Appeared in Year: 2013

Question MCQ▾

The spacing between vibration energy levels in molecule is found to be . Given that the reduced mass of is , Plank՚s constant is and . The force constant of the bond in molecule is –

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 33

Appeared in Year: 2011

Question MCQ▾

For a multi – electron atom specify the one – electron orbital angular momentum, total orbital angular momentum and total spin angular momentum, respectively. The selection rules for electric dipole transition between the two electronic energy levels, specific by are –

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 34

Appeared in Year: 2011

Question MCQ▾

The population inversion in a two level laser material cannot be achieved by optional pumping because,

Choices

Choice (4)Response

a.

The upward transition are allowed but downward transition are forbidden

b.

The rate of upward transition is equal to the rate of downward transitions

c.

The spontaneous decay rate of the higher level is very low

d.

The upward transition are forbidden but downward transition are allowed

Edit