Answer: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
The frequency of near infrared light with a wavelength of 1200 nm is 2.5 × 10¹⁴ per sec.
Frequency of any light is inversly proportional to the wavelength of the light as:
υ ∝ 1/λ
υ = c/λ, where
c = speed of light = 3.8 × 10⁸ m/sec
λ = wavelength of light = 1200nm = 1200×10⁻⁹m
On puuting values, we get
υ = (3.8 × 10⁸m/sec) / (1200×10⁻⁹m)
υ = 2.5 × 10¹⁴ per sec.
Hence required frequency is 2.5 × 10¹⁴ per sec.
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