What are the two basic conditions necessary for laser action?

What will be an ideal response?


population inversion and stimulated emission

Physics & Space Science

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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