Q. 8

Which of the following sources gives best monochromatic light?
A. A candle

B. A bulb

C. A mercury tube

D. A laser

Answer :

In a laser, only those photons with energy equal to the excitation energy of the electron are given out. Hence, a laser is quite a precise monochromatic source. All others give off a range of wavelengths depending on the conditions.

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