The near infrared region of the electromagnetic spectrum extends from the end of the visible region at a wavelength of 700 nm to the mid-infrared at 2500 nm. What is the frequency of near infrared light with a wavelength of 1200 nm? (1nm = 1x10−9m)?

The frequency of near infrared light with a wavelength of 1200 nm =2.5 x 10^14 s-1

Explanation:

In an electromagnetic spectrum,

F= C/ λ

where F= FREQUENCY

C= SPEED OF LIGHT=3.0 x 10 ^8m/s

λ= WAVELENGTH= 1200nm to m becomes 1200 x 10^-9m

since 1nm = 1x10−9m

The frequency of near infrared light with a wavelength of 1200 nm= Speed of light / Wavelength

=3.0 x 10 ^8m/s/1200 x 10^-9m

The frequency of near infrared light with a wavelength of 1200 nm=2.5 x 10^14 s-1

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