Correct answer: (C) ultra violet. One has to use higher energy to produce radiation in the visible region. In CO_2 laser two electrodes produce discharge which is used. Therefore ultraviolet rays are used to produce light in any lower energy region.

Q132 / 180 · AIIMS 2007 · Physics

\(\mathrm{CO}_2\) laser uses

A
microwaves
B
infra red
Correct answer
C
ultra violet
D
visible light

Solution

One has to use higher energy to produce radiation in the visible region. In \(\mathrm{CO}_2\) laser two electrodes produce discharge which is used. Therefore ultraviolet rays are used to produce light in any lower energy region.

Hence, the correct answer is option: 'C'.

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