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Answered

Which of the following is a true statement?

AElectromagnetic waves consist of only changing electric fields.
BElectromagnetic waves are longitudinal waves.
CElectromagnetic waves do not always need a medium to travel.
DElectromagnetic waves can vary in speed, wavelength and frequency.

Verified Answer :

olemakpadu
CElectromagnetic waves do not always need a medium to travel.

Since they are transverse waves they do not need a material medium.

Answer:

c. Electromagnetic waves do not always need a medium to travel.

Explanation:

As the name suggests Electromagnetic waves consist of Electric and Magnetic fields.

Electromagnetic waves are transverse waves.

In a given medium Electromagnetic waves cannot vary in speed. However their wavelength and frequency can vary.

When an Electromagnetic wave travels through a medium It does not displace the medium. So, electromagnetic waves do not need a medium to travel.

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