Question 2.5: Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm. Calculate the frequency (ν) and wave number 
of yellow light
of yellow light
Answer
From the expression,
We get,
v = c/λ …….. (i)
Where,
ν = frequency of yellow light
c = velocity of light in vacuum = 3 × 108 m/s
From the expression,
We get,
v = c/λ …….. (i)
Where,
ν = frequency of yellow light
λ = wavelength of yellow light = 580 nm = 580 × 10-9 m Substituting the values in expression (i):
Thus, frequency of yellow light emitted from the sodium lamp = 5.17 × 1014 s-1
Wave number of yellow light,
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