Question

Which of the following is correct about electromagnetic waves?
(A). Sound waves are electromagnetic in nature
(B). They travel in vacuum
(C). Electromagnetic waves are longitudinal (formation of compression and rarefaction) in nature
(D). X-rays are electromagnetic in nature
Choose the correct answer from the options given below:

• A. (A), (D), and (D) only
• B. (A), (B), and (C) only
• C. (B) only
• D. (B) and (D) only

Hint:

Mechanical waves such as sound require a medium to travel. The EM waves are transverse and can travel through a vacuum, and these waves consist of electric and magnetic fields perpendicular to the direction of propagation.

Answer 1

The Correct Option is D

Electromagnetic waves have the following characteristics:
• Travel in vacuum: They do not require a medium for propagation, unlike mechanical waves, such as sound.
• Transverse waves: Electromagnetic waves are characterized by oscillating electric and magnetic fields which are perpendicular to each other and also to the direction of wave propagation.
• Include X-rays and gamma rays: X-rays are a high-energy form of electromagnetic radiation, along with gamma rays, visible light, UV and radio waves
• Not sound waves: sound waves are mechanical waves and require medium for propagation. They are also longitudinal waves.
Therefore, statements B and D are correct, while statements A and C are incorrect.