# Wavelength times frequency

bonjour
equals speed?

I only ask as I couldn't find a solid answer online.

## Answers and Replies

bonjour
Isn't calling C the speed of light in e=mc2 misleading as light is a specific part of the electromagnetic radiation spectrum.

Shouldn't C be the speed ot the electromagnetic radiation spectrum

Mentor
Since all forms of electromagnetic radiation have the same speed in a vacuum, calling 'c' the speed of light is OK. Often all wavelengths, not just the visible, are referred to as 'light'.

bonjour
Right so then there would also be no objection to calling C the speed of gamma, or speed of infrared?

Mentor
Right so then there would also be no objection to calling C the speed of gamma, or speed of infrared?
Sure. No problem. All the same. Just calling it the 'speed of light' is more generic, though.

bonjour
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Mentor
Nope.

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