Which of the following is not an electromagnetic wave

Which one of the following is not an electromagnetic wave?

sound waves
gamma rays
radio waves
ultraviolet
infrared

Answer

General guidance

Concepts and reason
Electromagnetic waves are propagated by periodic variations of electric field and magnetic field. The speed of the electromagnetic waves is, –
ץ
VME Here, is the permeability of free space and is the permittivity of free space.

Fundamentals

Step-by-step

Step 1 of 2

The electromagnetic wave is travelling with a speed equal to the speed of light. The electromagnetic spectrum consists of high wavelength to low wavelength, starting from radio waves, microwaves, infrared radiation, visible light, ultraviolet rays, x rays, and gamma rays. Radio waves, infrared radiation, ultraviolet rays, and gamma rays are electromagnetic waves. These waves have particle nature and can travel both in air and vacuum, depending upon the medium.

The speed of light is only constant in vacuum. The speed of light can be changed in different mediums. The speed of the electromagnetic waves is, –
ץ
VME Substitute for and for .

Step 2 of 2

Since the sound wave does not have electric field and magnetic fields, it is not a electromagnetic wave. The speed of the sound waves depends on the medium.

Sound wave is not an electromagnetic wave.


Since the sound wave is produced by two objects. Sound waves are longitudinal waves. Sound waves can travel only by air. A sound wave does not travel through any other medium.

Answer

Sound wave is not an electromagnetic wave.

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