Multiple Choice
Which of the following is essential for the laser action to occur between two energy levels of an atom?
A) the lower level is metastable
B) there are more atoms in the upper level than in the lower level
C) there are more atoms in the lower level than in the upper level
D) the lower level is the ground state
E) the lasing material is a gas
Correct Answer:
Verified
Correct Answer:
Verified
Q34: Five electrons are in a two-dimensional square
Q35: In connection with x-ray emission the
Q36: Which of the following subshells cannot exist?<br>A)3p<br>B)2p<br>C)4d<br>D)3d<br>E)2d
Q37: A magnetic dipole <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6585/.jpg" alt="A magnetic
Q38: An electron in an L shell
Q40: No state in an atom can be
Q41: The ratio of wavelength of K
Q42: In a Moseley graph:<br>A)the x-ray frequency is
Q43: The magnetic field <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6585/.jpg" alt="The magnetic
Q44: In a helium-neon laser, the laser light