Echo
- An echo is a sound that is reflected off a surface and returns to the listener.
- It is created when a sound wave travels through a medium and bounces back after hitting a surface that is capable of reflecting sound.
- The time delay between the original sound and the reflected sound is what creates the echo.
In physics, echoes have a variety of applications, including:
- Sonar and radar: to determine the distance and shape of objects in the ocean or in the air.
- Acoustic testing: to evaluate the sound quality of rooms, auditoriums, and concert halls
- Wildlife management: to study the vocalizations of animals and their habitats
- Geological exploration: to map the interior of the Earth, by analyzing the echoes of seismic waves.
- Medical imaging: to examine internal organs, using ultrasound.