The wavelength of a spectral line of cesium is 460nm. Calculate the frequency of the line.

Use the formula

c = νλwhere c = speed of light = 3×108 m/sν = frequency of lightλ= wavelength = 460 nm = 460 ×10-9 mSo, ν=cλ          =3×108m/s460 ×10-9 m           =6.52×1014 s-1

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c=wavelength×frequncy
i.e.
3×10^8=460×10^-9 ×f
f= 6.52×10^14
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