Question

30.
The rate of rotation of the Earth is determined by
(a) He-Ne laser (b) Pulsed laser (C)
(b) Pulsed laser (c) Ruby laser
(d) none of these​

Answer 1

Answer:

D. (None of these)

Explanation:

The ring. A ring laser uses two single-mode laser beams that propagate around a closed laser cavity in opposing directions. If a ring laser is rotating, the two opposing waves are slightly shifted in frequency and a beat interference pattern is observed, which is proportional to the rate of rotation.