Question

The membrane of a drum vibrates to produce sound. Similarly, the strings of a sitar vibrate to produce sound. Based on these two examples, answer the following question. Which part of a whistle vibrates to produce sound.

• A. Body of whistle.
• B. Air.
• C. Mouth of the person.
• D. All of the above

Answer 1

The correct option is B

Air.

1. One end of the whistle is open and the other end is closed.
2. When we blow air in a whistle, air flows from the open end of the whistle to the closed end.
3. Air molecules at the closed end pile up.
4. Due to the piling up of air molecules, high pressure is produced inside the whistle.
5. The hole provided in the body of the whistle helps the air to escape.
6. During the escape of air via the hole, the air vibrates and produces sound.
7. Conversion of pressure energy into sound energy is the basic principle of working a whistle.

Hence, option (B) is correct.