You’re going to need to know your way around the E-M spectrum.
For instance…
- which type of radiation has the highest frequency?
- what is range of wavelengths of visible light?
- what types of E-M radiation can penetrate the atmosphere?
There are lots of diagrams showing the E-M spectrum. This is a pretty good one which gives some visual clues to help you remember the details.
Click on the image for a bigger version.
Acknowledgment
NB. I found this diagram on the web, but I can’t find who originated it. I would be very happy to give credit where it’s due, and acknowledge the author, so if it’s you, get in touch via the contact page