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.

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

The black hole is ( ), and no particle or electromagnetic radiation can escape from it.

When these electromagnetic waves escape from the conductor into space, they are said to be radiated by the conductor, hence the name radio waves.

The sound wave is (). A: Mechanical transverse wave B: Mechanical longitudinal wave C: Electromagnetic wave D: X<br/>rays.

“To persuade my audience that long-term exposure to electromagnetic fields can cause serious health problems” is a specific purpose statement for a persuasive speech on a question of_____________.

Scattering is the change in the direction of electromagnetic energy caused by ( ). A: Particles suspended in the atmosphere B: Water droplets C: Large molecules of atmospheric gases D: Dust

When the secondary side of the electromagnetic current transformer is in normal operation, it is close to ( ) state. A: Overvoltage B: Open C: Short circuit D: Under voltage

What kind of wave does ultrasound belong to and has certain radiation? A: Electromagnetic wave B: Mechanical wave C: Particle wave D: Light wave