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→Interference: I added the footnote which I forgot to add.
A larger refraction causes a reflection. When the warm air is a lot warmer than the cooler air, the sound bounces off of the warm air heads back toward the ground – still moving away from the source of the sound. When a man yells on a winter morning on one side of a lake, the sound waves might bounce off the sky and be heard on the other side of the lake, but not in the afternoon when the ground is warmer.<ref name="Stevens & Warshofsky Chapter One" />
A larger refraction causes a reflection. When the warm air is a lot warmer than the cooler air, the sound bounces off of the warm air heads back toward the ground – still moving away from the source of the sound. When a man yells on a winter morning on one side of a lake, the sound waves might bounce off the sky and be heard on the other side of the lake, but not in the afternoon when the ground is warmer.<ref name="Stevens & Warshofsky Chapter One" />
===Interference===
===Interference===
“Interference is when sound waves bump into each other, decreasing the quality of the sound. Sound waves are areas of high followed by low pressure or closeness of molecules. The high areas are compressions and the low are rarefactions. When the compression of one wave fills in the rarefaction of another, the volume is lowered. When two compressions join, the sound is unnaturally louder. The sound waves of a tuning fork interfere with each other to some extent. If the tuning fork is turned while sounding, the volume rises and falls from interference. "Dead" spots in auditoriums are caused by sound waves canceling each other, causing the volume of those spots to be less.
“Interference is when sound waves bump into each other, decreasing the quality of the sound. Sound waves are areas of high followed by low pressure or closeness of molecules. The high areas are compressions and the low are rarefactions. When the compression of one wave fills in the rarefaction of another, the volume is lowered. When two compressions join, the sound is unnaturally louder. The sound waves of a tuning fork interfere with each other to some extent. If the tuning fork is turned while sounding, the volume rises and falls from interference. "Dead" spots in auditoriums are caused by sound waves canceling each other, causing the volume of those spots to be less.<ref name="Stevens & Warshofsky Chapter One" />
== Subcategories of Sound ==
== Subcategories of Sound ==