Question

Calculate the frequency of yellow light of wavelength 750 nm.

Answer 1

Given :
c= 3x 10 ^8
wavelength =550nm = 550x 10^-9 m
frequency = v = c/ wavelength
=3*10^8/550x 10^-9
=545*10^14 hertz


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Answer 2

Answer : The frequency of yellow light is $4\times 10^4s^{-1}$.

Solution : Given,

Wavelength of yellow light = 750 nm = $750\times 10{-9}m$      $(1nm=10^{-9}m)$

Formula used :

$\nu=\frac{c}{\lambda}$

where,

$\nu$ = frequency of light

c = speed of light = $3\times 10^8m/s$

$\lambda$ = wavelength of light

Now put all the given values in this formula, we get the frequency of yellow light.

$\nu=\frac{3\times 10^8m/s}{750\times 10{-9}m}=0.004\times 10^{17}=4\times 10^{14}s^{-1}$

Therefore, the frequency of yellow light is $4\times 10^4s^{-1}$.