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

Key characteristics of electromagnetic waves include:
• Vacuum propagation: Unlike mechanical waves (e.g., sound), electromagnetic waves do not require a medium to travel.
• Transverse nature: They consist of oscillating electric and magnetic fields that are mutually perpendicular and also perpendicular to the direction of propagation.
• Spectrum components: The electromagnetic spectrum includes high-energy forms like X-rays and gamma rays, alongside visible light, UV, and radio waves.
• Distinct from sound waves: Sound waves are mechanical, longitudinal, and require a medium for propagation, differentiating them from electromagnetic waves.
Thus, statements B and D are accurate, whereas A and C are not.