Here is a trick to remember the order of electromagnetic spectrum:
The trick is to remember this spooky sentence:
Guests experience unusual vibrations in my room.
Hurray! This trick is now also available as a video with tables and graphics for easy learning.
You can watch it for free here: https://youtu.be/EFE2XPAgBKY
Here is a trick to remember electromagnetic waves in order of increasing frequency:
Roman Men Invented Very Unsual Xray Guns