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Let's take

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a listen to some different frequencies.
Frequency relates to pitch in world of sound.

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Here is 440. Pure sine wave

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440. Square wave

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Sawtooth wave. Triange.

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Back to our pure sine wave. What happens
if we jump to 880?

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An octave. And how about 1760. Other octave A.

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Let's bring down our amplitude.

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This frequency player can be found at onlinegenerator.com.

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Here's another tone generator
also an online version

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at nison.com. Let's see what we have. You can barely hear it.

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174.61 hertz

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It's G at

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196 hertz. Hertz being cycles per second. Let's

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see what happens if we increase our hertz manually. And let's decrease the hertz. 
Here's 750. And we have different wave forms we can expirement with. And we

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can increase with our arrows, increase in hertz
for cycles per second. And back down again.

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Again here's our picture of pure sine wave.