Reflection of sound waves also leads to echoes. Echoes are different than reverberations. Echoes occur when a reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.
- Reflection of sound waves also leads to echoes. Echoes are different than reverberations. Echoes occur when a reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.
When a sound wave travels from air into water, several properties will change. The wave speed will increase as the wave crosses the boundary into the water causing the spacing between crests (the wavelength) to increase, because crests move away from the boundary faster than they move up to the boundary.
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