Question

This part of the electromagnetic spectrum can be used to generate power
A. Gamma rays
B. Radio waves
C. Microwaves
D. Infrared rays

Answer 1

X-rays can be used to generate power as they have very high kinetic energy.
Similarly, Gamma-rays can be used for such, like making Cathode-ray guns.

Answer 2

The power generation using electromagnetic wave is an idea first proposed by Einstein in photo electric effect , all of these option can be used for this by using laser beam production mechanism or by using transducer for converting them in energy good for photoelectric system or by using any other alloy material for that.