1. The wavelength of a violet light is 400 nm. Calculate the frequency and wavenumber.
Answers
Answered by
12
Given:
The wavelength of a violet light = 400 nm = 400 × m
We have to calculate the frequency() and wave number.
Solution:
∴ Frequency() =
Where, c = velocity of light = 3 × m
Frequency() =
=
= 0.0075 × Hz
= 7.5 × Hz
Also,
Wave number =
=
= 0.0025 ×
= 2.5 ×
∴ Frequency() = 7.5 × Hz and
Wave number = 2.5 ×
Answered by
17
Given:
The wavelength of the violet light = 400nm
To find:
The frequency and the wave number of the violet light used.
Solution:
The frequency is given as: f = c/λ
Where c is the speed of light in vacuum. Therefore:
f = 3*10⁸ / 400*10⁻⁹ = 7.5*10¹⁴ Hz
Wave number is given as: w= 1/λ
w = 1/ 400*10⁻⁹ = 2.5*10⁶ m⁻¹
Therefore the frequency of the violet light is 7.5*10¹⁴ Hz and its wave number is 2.5*10⁶ m⁻¹.
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