Give two practical application of reflection of sound waves?

Question: Give two practical application of reflection of sound waves?

1. Ultrasonic Testing: Ultrasonic testing can measure material properties and defects in various structures. These sound waves are reflected and absorbed by objects of different densities and thicknesses, creating an echo-wave that can allow the technician to determine the thickness of the material or the presence of any contaminants.

2. Acoustic Echo Cancellation: Acoustic echo cancellation can be used to eliminate unwanted echo in audio devices such as loudspeakers or headphones. It works by sending sound waves out and then measuring the reflection of sound waves after it bounces off walls and other objects. The sound is then filtered using algorithms, eliminating that unwanted echo.

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