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A certain helium -neon laser emits red l...

A certain helium -neon laser emits red light in a narrow band of wavelengths centered at 632.8 nm and with a wavelength width (such as on the scale of Fig .32-1) of 5.00 pm. What is the corresponding frequency width for the emission ?

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`3.75 xx10^(9) Hz~~ 3.75 GHz `
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