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An echo is caused when sound waves bounce off of a surface and travel back to the ears. Echoes commonly occur when loud sounds are emitted into an empty room or down a well. The echo occurs when sound is reflected off water in the well or walls in rooms.


Echoes work through the reflection of sound waves. When a person shouts into a well or canyon, and they hear an echo, it is because the sound waves reflect from the canyon wall or the bottom of the well and travel back to the person's ears.


An echo test, also known as an echocardiography or diagnostic cardiac ultrasound, shows all of the details of a person's heart. This includes the structure, size, movements, valves, septum and the various walls of the heart, according to The National Heart, Lung and Blood Institute.


Echoes are created by sound waves being reflected off of a large obstacle. Conditions have to be just right for the echo to be heard as a separate sound.


An echo occurs when a sound wave reflects back towards its source after hitting a hard surface. Although the surface may absorb some of the sound, the remaining sound that is not absorbed continues moving, creating additional echoes by bouncing off surrounding objects until the sound is completely a


As of 2016, find replacement parts for an Echo at Echo-USA.com, HomeDepot.com and RepairClinic.com. The Echo company recommends that owners perform maintenance annually by replacing parts such as the fuel and air filters and spark plugs.


A heart echo test, or echocardiography exam, is a painless test that examines the structure and function of the heart, according to the National Institutes of Health. This test may involve the injection of saline or a specific dye into the patient's veins to showcase his heart more easily.


An echo test, or echocardiogram, is an ultrasound test used to view moving pictures of the heart on a screen, states WebMD. During this test, high-pitched sound waves are sent through a transducer, a device that picks up sound waves as they echo off the various parts of the heart.


An echo can be heard in a cave when a sound reflects off surrounding walls and then is heard again. It is also possible to hear an echo in an empty room, in a mountain valley, under a bridge or by calling down into a well.


An echo stress test, or stress echocardiography, is a simple test that utilizes ultrasound imaging to view a patient's heart after he exercises. The test is ordered by doctors to determine if a patient has proper blood flow in his heart, according to MedlinePlus.