# Question #22228

Dec 2, 2014

You can calculate the frequency($\nu$) of an electromagnetic wave by using the equation:
the speed of light(c)=frequency($\nu$)*wavelength($\lambda$)
$c = \nu \cdot \lambda$

An important thing to know is that this is an algebraic equation, so we can solve for an individual piece by using our algebra rules; in this case to solve for frequency.
Our new equation would be:
$\nu = \frac{c}{\lambda}$

Also since the speed of light is given in units of meters/second & the wavelength will be in nanometers, you will have to convert your wavelength to units of meters to get the correct units for frequency (1/second.)

As electromagnetic radiation moves away from its source the positions of maximum and minimum amplitude-peaks and troughs-are regularly spaced.

The distance from peak-peak or from trough-trough is called the wavelength ($\lambda$)

you can also use the same method as shown above to solve for $\lambda$ if you know the $\nu$
$\lambda = \frac{c}{\nu}$