Question

Which statement is true?

1) Electromagnetic waves can't travel in perfect vacuum.
2) Speed of light in air is lower than in glass.
3) Radio waves in the AM band are not electromagnetic waves.
4) Some electromagnetic waves will pass through walls that light cannot penetrate.
5) In air light travels much faster than radiation from microwave oven.

Answer 1

The statement that 'Some electromagnetic waves will pass through walls that light cannot penetrate' is true, demonstrating the variety of interactions different wavelengths of electromagnetic waves have with matter.

Step-by-step explanation:

From the given options, the true statement is number 4): Some electromagnetic waves will pass through walls that light cannot penetrate. This is accurate because different electromagnetic waves have different wavelengths and therefore interact with matter in various ways.

For example, radio waves or microwaves can penetrate walls, which visible light cannot. As electromagnetic waves do not require a medium to travel through, they can move through a vacuum, like the vacuum of space, at the constant speed of light, which is approximately 3.00 × 10⁸ m/s.

The statement that 'Some electromagnetic waves will pass through walls that light cannot penetrate' is true, demonstrating the variety of interactions different wavelengths of electromagnetic waves have with matter.