Example problems:
You can hunt for scorpions in your bed with an LED
flashlight that has a wavelength of 365 nanometers.
If 1 meter is equal to 1x10-9 nm, what is the
frequency of this flashlight?
Convert 365 nanometers to meters
365 nanometers = 365 x 10-9 m
Solve, using c= λ f
so
3x108 = 365 x 10-9 * f
(rearrange and solve for f)
ANSWER= 8.2 x 1014 Hz