All of the following statements about electromagnetic radiation are true except:

1) all electromagnetic radiation travels at the speed of light.
2) all electromagnetic radiation can be considered a form of light.
3) all electromagnetic radiation can be seen.
4) all electromagnetic radiation travels in waves.

The one that is false in this case is 3) All EMR can be seen. We cannot see EMR that is below visible light with the naked eye.

However with this question, one thing that I would like to point out is that EMR only travels at the speed of light when it is in a vacuum a.k.a. air. Otherwise it doesn't travel at the speed of light because it could be refracted.

Sorry i don’t know what to do