A certain helium-neon laser emits red light in a narrow band of wavelengths centered at 632.8 nm

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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 Figure) of 0.0100 nm. What is the corresponding "frequency width" for the emission?
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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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