electromagnetic waves
举一反三
- When these electromagnetic waves escape from the conductor into space, they are said to be radiated by the conductor, hence the name radio waves.
- How is television different from radio A: Sound is changed into electromagnetic waves. B: Light is changed into electromagnetic waves. C: Both sound and light are changed into electromagnetic waves. D: Either sound or light is changed into electromagnetic waves.
- Which one in the following is not one of the categories of wireless charging? It is _____. A: electromagnetic radiation B: inductive coupling C: magnetic resonant coupling D: electromagnetic induction
- Which type of earthquake wave is a compressional wave? A: P-waves B: surface waves C: long waves D: S-waves
- The black hole is ( ), and no particle or electromagnetic radiation can escape from it.