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Question: What will be the wave number of yellow radiation having wavelength 240 nm?...

What will be the wave number of yellow radiation having wavelength 240 nm?

A

1.724×104cm−11.724 \times 10^{4}cm^{- 1}

B

4.16×106m−14.16 \times 10^{6}m^{- 1}

C

4×1014Hz4 \times 10^{14}Hz

D

219.3×103cm−1219.3 \times 10^{3}cm^{- 1}

Answer

4.16×106m−14.16 \times 10^{6}m^{- 1}

Explanation

Solution

: Wavelength of yellow light = 240 nm = 240×10−9m240 \times 10^{- 9}m

Wavenumber (υ__)=1λ=1240×10−9m(\overset{\_\_}{\upsilon}) = \frac{1}{\lambda} = \frac{1}{240 \times 10^{- 9}m}

=4.16×106m−1= 4.16 \times 10^{6}m^{- 1}