Electromagnetic or radio frequency will be all but commercial frequency, there will be some similar properties, such as radio waves to reflect back. Refraction and deviation, etc.
Electromagnetic wave Or radio frequency is the frequency range, but it has some features that are similar, such as radio waves with the reflection, refraction, and deviation and so on.
Electromagnetic waves. Radio frequency or a wide but all frequencies have some properties similar, such as radio waves are qualified in reflection. Refraction and diversion, etc.