Lesson: Chapter 4 — Waves and their applications

4.2.2. Uses of electromagnetic waves 4 of 6 Reset answers

Clear all your answers?

This erases every answer in this set and starts you again at question one. Your score will be gone.

Type these four numbers to confirm:

Those numbers don't match. Look at them again and type them.

Yes, clear Keep them

Question 4

A television remote control sends its signal using…

A ultraviolet B sound waves C infrared D X-rays

The right answer is the one marked above.

Infrared. Infrared is invisible, which is why you cannot see the remote's signal even though it reaches the television.

Answer the question to continue.