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Electromagnetic radiation and spectra

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Question

Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm, the frequency (v¯) of the yellow light is 5.1724×10xs1. The value of x is

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Solution

 Wavelength of yellow light =580nm=580×109m c (velocity of light) =3.0×108ms1   Frequency, (v)=cλ=3.0×108ms1580×109m =5.1724×1014s1


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