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. |
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. |
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. |
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 |