# Need help with argument about wave equation

1. ### Pseudo Epsilon

102
in the equation v=f$$/lambda$$ can you use c instead of v for wavespeed?

2. ### tiny-tim

26,054
Hi Pseudo Epsilon!
If c = v, yes.

(ie electromagnetic waves in a vacuum)

3. ### Pseudo Epsilon

102
but ive heard it used for other things. Cant it EVER be used for non-em waves? Would it e incorect?

4. ### Vagn

411
It depends on whether or not you are using c to mean the speed of light in a vacuum. If you are then you can't use it as that isn't the speed of the wave. If you are using it as a general speed of a wave and not ##3 \times10^8## then you could use it in the same way as you could use any other symbol, however using c does risk confusion.

5. ### tiny-tim

26,054
and c-sickness!

all those waves

102
lol.thanks