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VOOZH | about |
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VOOZH | about |
Refraction of sound is the bending (change in direction) of sound waves when they travel from one medium to another or through regions where conditions like temperature or density change
This happens because the speed of sound is different in different media (like air, water, or solids). When part of a sound wave enters a region where it travels faster or slower, the wave changes direction.
The temperature of the medium has an impact on the speed of sound in the air, with the wave traveling more quickly at warmer temperatures and more slowly at cooler ones. The direction of propagation of sound waves varies when portions of the wave are in layers of a medium that are at different temperatures and, as a result, are moving at different speeds. This results in the refraction of sound waves.
An echo is a reflected sound that is heard again after the original sound is produced. It occurs when sound waves hit a hard, smooth surface like a wall, cliff, or mountain and bounce back to the listener. This reflected sound is heard as a repetition of the original sound. Echoes are commonly heard in places such as caves, wells, valleys, or mountainous areas where there are large hard surfaces. However, soft surfaces like curtains, cushions, or carpets absorb sound waves instead of reflecting them, so no echo is produced in such cases.
Minimum Distance Required To Hear An Echo
An echo is only heard if the distance between the person making the sound and the stiff obstruction is sufficient for the reflected sound to reach the person at least 0.1 seconds after the original sound is heard. Otherwise, the echo is undetectable even when it reaches the ears. This value may be computed and is 17.2 m for air and 70 m for water.
