Which among the following instruments work on principles of destructive interference of sound waves?
1. Microphone
2. Silencer of a vehicle
3. Music instruments

Select the correct option from the codes given below:

Answer: [D] 1, 2 & 3

A vehicle silencer works on the principle of destructive interference of sound waves. Inside the silencer, a set of tubes are designed to deliberately reflect sound waves originating from the engine. These reflected waves, interfere and cancel out each other This is how the sound coming out of an engine, in drastically reduced.

This question is a part of GKToday's Integrated IAS General Studies Module