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Frequency, Speed of Light, Wavelength in a Vacuum

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The so-called "hydrogen alpha (Ha) line" is a specific wavelength of red light caused by excited atomic hydrogen. It is frequently used when studying the Sun. The wavelength of Ha is 656.3 nm, or 656.3*10-9 m. The speed of light in vacuum is 3*108 m/s. What is the frequency (in units of cycles per second, or 1/s) of Ha in vacuum?

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Solution Summary

Frequency, speed of light, and wavelength in a vacuum are examined. A complete, neat and step-by-step solution is provided.

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