is this correct? the problem: what is the frequency & the type of energy of a wave w/ a λ=2x10^–4 m?

Question

my answer: ν = 3x10^8 m/s / 2x10^–4 m = 1.5x10^12 Hz, but how to u know which type of energy is this?

Answer 1

There is a table at http://en.wikipedia.org/wiki/Electromagnetic_spectrum
10-4m=100 X 10-6m=100 microns which is in the far inferred