The pitch of the sound is related to the frequency of the sound waves
This image shows two sound waves displayed on an oscilloscope. The red wave has smaller wavelength than the blue wave hence it has higher frequency and higher pitch
This image shows two sound waves displayed on an oscilloscope. The blue wave has twice the amplitude of the green wave because the blue wave is louder
The range of human hearing is between 20 – 20 000 Hz. Below 20 Hz is known as infrasound. Above 20 000 Hz is known as ultrasound
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