Which describes an electromagnetic wave?
a longitudinal wave that can travel through matter or empty space
a transverse wave consisting of changing electric fields and changing magnetic fields
a transverse wave consisting of electric fields and magnetic fields traveling through matter
a longitudinal wave that travels through solids, liquids, and gases

a transverse wave consisting of changing electric fields and changing magnetic fields

Explanation:

Electromagnetic waves are waves consisting of changing electric fields and magnetic fields oscillating perpendicularly to each other.

Moreover, the electric and the magnetic field oscillate in a plane perpendicular to the direction of propagation of the wave: for this reason, we say that electromagnetic waves are transverse waves.

All electromagnetic waves travel through a vacuum at the same speed, called speed of light, whose value is approximately

Moreover, electromagnetic waves are classified into 7 different types according to their different wavelengths. From shorter to longer wavelengths, these types are called:

Gamma rays

X-rays

Ultraviolet

Visible light

Infrared

Microwaves

Radio waves

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