One of nature's greatest wonders is the ability of the human ear
To distinguish among the millions of sounds around us
Listen
Recognize those sounds?
(Surely)
Loudness level
Recognize those sounds?
Listen
Some sounds appear higher or lower to our ears than others
The term we use to describe this relative characteristic is pitch
Pitch depends chiefly on the number of times each second
That the air pressure fluctuation on your ear is repeated
Listen as we vibrate 440 times a second
Let's investigate what causes sound
Listen
Loudness level
Similarly
Loudness level
(Listen)
Loudness level