Given the task definition and input, reply with output. Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Light falls roughly in the middle of the electromagnetic spectrum, having shorter wavelengths and higher frequencies than microwaves, but not as short and high as x rays.
What falls roughly in the middle of the electromagnetic spectrum, having shorter wavelengths and higher frequencies than microwaves, but not as short and high as x rays?