Question

Which statement about electromagnetic waves is true? A. Electromagnetic waves require a medium to travel. B. Electromagnetic waves don't require a medium to travel. C. The particles of the medium through which electromagnetic waves travel vibrate perpendicularly to the direction of the wave. D. The particles of the medium through which electromagnetic waves travel vibrate parallel to the direction of the wave.

Answer 1

Explanation:

2 options are correct

B and C are correct.

Answer 2

Answer:

Electromagnetic waves don't require a medium to travel.

Explanation:

Electromagnetic waves:

• The oscillations between an electric field and a magnetic field produce waves known as electromagnetic waves, or EM waves.
• In other words, electromagnetic (EM) waves are created when magnetic and electric fields oscillate.

Characteristics of Electromagnetic Wave:

• The nature of electromagnetic waves is transverse. The magnetic and electric fields are parallel to one another.
• Electromagnetic waves are created by accelerating charges.
• In a vacuum, these waves move at a constant speed of 3 x 108 m/s.
• A medium is not required for electromagnetic waves to travel.
• When a wave moves from one medium to another, its frequency doesn't change, but its wavelength does.
• It responds to the super positional law.
• The magnitudes of the oscillating electric and magnetic fields have a fixed ratio and are in phase.
• In electromagnetic waves, the electric energy is equal to the magnetic energy.
• The energy delivered by electromagnetic waves per unit area is represented by the Poynting vector.

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