Which statement is true?
A) Speed of light in air is lower than in glass.
B) Radio waves in the AM band are not electromagnetic waves.
C) Some electromagnetic waves will pass through walls that light cannot penetrate.
D) In air light travels much faster than radiation from a microwave oven.
E) Electromagnetic waves can't travel in perfect vacuum.

Question

Quizplus · Accepted Answer

It is true that some electromagnetic waves, such as radio waves and microwaves, can pass through certain materials such as walls, while visible light cannot. The other choices are incorrect: A is false because the speed of light is actually higher in air than in glass; B is false because radio waves in the AM band are a type of electromagnetic wave; D is false because light always travels faster in a vacuum than any other form of radiation; and E is false because electromagnetic waves are able to propagate through a vacuum.

Which Statement Is True