Reflecting mirrors in laser is used to______________?

Related Mcqs:

In hydrogen spectrum which one of the following series lies in the ultraviolet region ?

A. Balmer series B. Pfund series C. Bracket series D. Lymann series...

Excited atoms return to their ground state in_______________?

A. 10-10s B. 10-8s C. 10-6s D. 10-9s...

The electric P.E of an electron in an orbit at a distance rn from the positive charge_____________?

A. Ke2/rn B. Ke2/rn2 C. ÀKe2/rn D. ÀKe2/rn2...

Bracket series is obtained when all transition of electron terminate on_______________?

A. 4th orbit B. 5th orbit C. 3rd orbit D. 2nd orbit...

X-rays are diffracted by a crystal but not by a diffraction grating because_____________?

A. The ions in a crystal are well arranged B. The lines in a diffraction grating cannot reflect X-rays. C. The penetration power of X-rays is high in a diffraction grating D. The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal...