Electromagnetic WavesHard
Question
Frequency of infrared wave is approximately;
Options
A.1018 Hz
B.1014 Hz
C.109 Hz
D.1016 Hz
Solution
We know that visible light has wavelength in the region of 4000 
- 7000 . If we takeinfrared as approximately having wavelength of 7000 then applying vλ = c
v × 7000 × 10-10 = 3 × 108
v =
× 1015 Hz
= 4.3 × 1014 Hz
- 7000 . If we takeinfrared as approximately having wavelength of 7000 then applying vλ = cv × 7000 × 10-10 = 3 × 108
v =
× 1015 Hz= 4.3 × 1014 Hz
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