Question

The wavelength of blue light is 480nm. calculate the frequency and wave number of this light

Answer 1

the frequency=6.25*10^26

Answer 2

Given:

Wave length = 480nm = 4.8 ×$10^{-7}$

To find:

Frequency = ?

Wave number = ?

Formula to be used:

• Frequency = $\frac{C}{\lambda}$
• Wave number = $\frac{1}{\lambda}$

Calculation:

Frequency of the light:

Frequency =  $\frac{C}{\lambda}$

Frequency = $\frac{3\times10^8}{4.8\times 10^{-7}}$

Frequency = $6.25\times 10^{14}Hz$

Wave number of the light:

Wave number = $\frac{1}{\lambda}$

Wave number = $\frac{1}{4.8\times10^{-7}m^{-1}}$

Wave number = 0.208333×$10^{-7}m^{-1}$

Wave number = 2.0833×$10^{-4}cm^{-1}$

Conclusion:

The frequency and wave number of light with wave length is calculated as  $6.25\times 10^{14}Hz$ and 2.0833×$10^{-4}cm^{-1}$ respectively.

Learn more about wave number

Calculate the frequency and wavenumber of blue light of wavelength 4800A?

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Energy of a photon having wavenumber 1.00 cm^-1 is?

A) 6.62x10^-34

B) 1.99x10^-23

C) 6.62x10^-32

D) 6.62x10^-36

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