With reference to the applications of sound waves, consider the following statements: a. Sonar is a technique often used on boats to locate fish and measure depth. b. Ultrasound cannot be used for cleaning purposes. c. Sonochemistry is a research area regarding the use of ultrasound to induce chemical reactions. Which of the statements given above are correct?

When a longitudinal sound wave propagates through air, what happens at a region of compression?

The loudness of sound depends on the amplitude of vibration such that loudness is:

Consider the following statements: 1. The loudness of a sound is determined basically by its frequency. 2. The frequency of the sound wave does not change when it travels from one medium to another. 3. Audible range of the average human ear extends from about 20 Hz to 20 kHz. How many of the statements given above are correct?