Give two practical applications of reflection of sound waves.

Two practical applications of the reflection of sound waves are:

1. Sonar (Sound Navigation and Ranging): Sonar uses the reflection of sound waves to detect and locate objects underwater. A sound pulse is emitted from a source, and the time it takes for the reflected sound to return is measured. This time is then used to calculate the distance to the object. Sonar is used in various applications, including navigation, fishing, mapping the seabed, and detecting submarines.

2. Ultrasound imaging: Ultrasound imaging uses high-frequency sound waves that are reflected by tissues and organs within the body. A transducer emits ultrasound pulses, and the reflected waves are detected and processed to create an image. Different tissues reflect sound waves differently, allowing doctors to visualize internal structures and detect abnormalities. Ultrasound is a non-invasive and relatively safe imaging technique used for various diagnostic purposes in medicine.