Which statement is true- PHYSICS QUESTION...

Question

Which statement is true?

Electromagnetic waves can't travel in perfect vacuum.

Speed of light in air is lower than in glass.

Radio waves in the AM band are not electromagnetic waves.

Some electromagnetic waves will pass through walls that light cannot penetrate.

In air light travels much faster than radiation from microwave oven.

Answer 1

The fourth statement is the correct statement.  Electromagnetic waves WILL pass through essentially anything except black holes or other extreme anomalies.

Answer 2

Some electromagnetic waves will pass through walls that light cannot penetrate.  

Answer 3

Some electromagnetic waves will pass through walls that light cannot penetrate (such as X-ray, gamma ray)