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Calculate the...

Question

Calculate the wave number of line frequency of 4 × 10¹⁴sec^-1.

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Solution

Wave Number = 1/ Wavelength
But wavelength = Speed of light/frequency
So Wave Number = Frequency / Speed of Light
= 4 X 10¹⁴/3 X 10⁸
Wave number = 1.33 X 10⁶

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