Answer: High energy and Low wavelength.
Step-by-step explanation: We are given an electromagnetic wave having high energy, so by using Planck's equation:

where, E = energy
h = Planck's constant
= frequency
here, Energy and frequency follow direct relation and hence high frequency means high energy.
and

= Frequency
c = speed of light
= wavelength
Here, the frequency is inversely related to the wavelength, hence high frequency means low frequency.