Single correct option
Consider the following statements about sound:
1. Sound waves in air are longitudinal.
2. Sound cannot travel through a vacuum.
Which of the statements given above is/are correct?
1. Sound waves in air are longitudinal.
2. Sound cannot travel through a vacuum.
Which of the statements given above is/are correct?
- A. 1 only
- B. 2 only
- C. Both 1 and 2
- D. Neither 1 nor 2
Show answer and solution
Answer: (C) Both 1 and 2
In air the particles vibrate along the direction of travel, forming compressions and rarefactions, so sound is longitudinal. Statement 1 is correct. Sound needs a material medium, unlike light, so it cannot pass through a vacuum. Statement 2 is also correct.
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