Sound and Waves — Prelims Questions

Which of the following statements about sound waves is/are correct? 1. Sound waves are electromagnetic waves. 2. Sound waves are longitudinal waves. 3. Sound waves can travel through a vacuum. 4. The speed of sound is highest in gases.

Consider the following statements regarding the Doppler effect: 1. It is observed only when the source and observer are in relative motion. 2. It explains the apparent change in frequency of a wave. 3. It is applicable to both sound and light waves. Which of the statements given above is/are correct?

Which of the following applications is NOT primarily based on ultrasonic waves?

A person standing between two parallel cliffs fires a gun. He hears the first echo after 2 seconds and the second echo after 3 seconds. If the speed of sound in air is 340 m/s, what is the distance between the two cliffs?

Which of the following factors does NOT affect the speed of sound in air?