Atomic and Molecular Physics MCQs Question and Answer in Engineering Physics

A. $${\cos ^{ - 1}}\frac{1}{{\sqrt 3 }}$$

B. $${\cos ^{ - 1}}\frac{2}{{\sqrt 3 }}$$

C. $${\cos ^{ - 1}}\frac{1}{2}$$

D. $${\cos ^{ - 1}}\frac{{\sqrt 3 }}{2}$$

A. The selection rule for vibrational spectroscopy is Δv = ±1, ±2, . . . .

B. Anharmonicity leads to multiple absorption lines

C. The intensities of hot band lines are stronger than the fundamental absorption

D. The frequencies of hot band lines are smaller than the fundamental absorption

A. 2B

B. 4B

C. 6B

D. 8B

A. 10 lines

B. 4 lines

C. 6 lines

D. 14 lines

A. 6

B. 10

C. 15

D. 150

A. the rate of upward transitions is equal to the rate of downward transitions

B. the upward transitions are forbidden but downward transitions are allowed

C. the upward transitions are allowed but downward transitions are forbidden

D. the spontaneous decay rate of the higher level is very low

A. P-4, Q-3, R-1, S-2

B. P-3, Q-2, R-1, S-4

C. P-2, Q-3, R-4, S-1

D. P-1, Q-4, R-2, S-3

A. $$\frac{2}{3}$$

B. $$\frac{3}{2}$$

C. $$\frac{3}{4}$$

D. $$\frac{4}{3}$$

A. $$\nu $$ and $$I$$

B. only $$\nu $$

C. only $$I$$

D. neither $$\nu $$ nor $$I$$

A. 0.5

B. 0.6

C. 0.8

D. 0.9