AFOQT Practice Test

Which of the following is considered an electromagnetic wave?

1. Sound wave

2. Ocean wave

3. Radio wave

4. Seismic wave

The correct answer is: Radio wave

An electromagnetic wave is a type of wave that consists of oscillating electric and magnetic fields and can travel through a vacuum as well as through various media. Radio waves fall within the electromagnetic spectrum, characterized by their long wavelengths and lower frequencies compared to other electromagnetic waves, such as visible light or X-rays. Radio waves are utilized in various technologies, including communication systems, broadcasting, and radar, which highlights their importance in both practical applications and fundamental physics. The nature of radio waves as an electromagnetic wave allows them to propagate over large distances and penetrate different materials, which is why they are widely used for transmitting information wirelessly. The other options represent different types of waves: sound waves are mechanical waves that require a medium to travel, ocean waves are surface waves occurring in water, and seismic waves are also mechanical waves that travel through the Earth. Thus, only radio waves from the choices provided can be classified as electromagnetic waves.