Question

Which of the following statements are correct?
(i) Velocity of sound waves is greater in solids than liquids.
(ii) Velocity of sound waves in vacuum is 330 m/s.
(iii) Sound waves are longitudinal waves.
(iv) Velocity of sound waves in vacuum is zero.

• A. (i) & (iv)
• B. (i), (ii) & (iii)
• C. (i), (iii) & (iv)
• D. (ii), (iii) & (iv)

Hint:

Remember, sound cannot travel in a vacuum because it requires a medium like air, water, or solids to propagate.

Answer 1

The Correct Option is C

Let’s break down the solution step by step: Step 1:
% Option (i) Velocity of sound waves is greater in solids than liquids.
This is true because sound waves travel faster in solids compared to liquids due to the denser packing of molecules in solids. Thus, the first statement is correct.

Step 2:
% Option (ii) Velocity of sound waves in vacuum is 330 m/s.
This statement is incorrect. Sound waves cannot travel through a vacuum because there are no particles to vibrate. Thus, the second statement is incorrect.

Step 3: % Option (iii) Sound waves are longitudinal waves.
This is correct. Sound waves are longitudinal waves, meaning that the particle displacement is parallel to the direction of wave propagation. Thus, the third statement is correct.

Step 4:
% Option (iv) Velocity of sound waves in vacuum is zero.
This is correct because sound waves cannot propagate in a vacuum, as there are no particles to transmit the sound energy. Thus, the fourth statement is correct.

Step 5:
Conclusion: The correct answer is (3) (i), (iii) & (iv) because statements (i), (iii), and (iv) are correct.