What are the two basic conditions necessary for laser action?
What will be an ideal response?
population inversion and stimulated emission
Physics & Space Science
You might also like to view...
the magnetic field in the primed frame.
A. A B. B C. C D. D E. Toward the viewer F. Away from the viewer T. There is no field of this type.
Physics & Space Science
What is true about Antares?
A: name means "Rival of Mars" B: ˜700 times the size of the Sun C: possibly egg-shaped D: cooler than the Sun E: all of the above
Physics & Space Science
When sound passes from air into water
A) its wavelength does not change. B) its frequency does not change. C) its velocity does not change.
Physics & Space Science
The first reptiles occurred during the
A) Tertiary. B) Ordovician. C) Triassic. D) Carboniferous.
Physics & Space Science