Frequency and Amplitude in Sound
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Sound frequency is the number of wave cycles per second and determines perceived pitch; amplitude determines perceived loudness.
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A tuning fork struck harder is louder at the same pitch, because amplitude changed and frequency did not.
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Pitch and loudness are perceptions. Frequency and amplitude are the physical properties behind them.