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Recognising Sounds

1.1 Music and sound

Wave speed = Frequency x Wavelength

Ultrasound = 20+ kHz
Infrasound = -20 Hz

Any two notes of frequency ratio 2:1 (i.e. one frequency is double the
other) are said to be separated by an octave.
Any two notes of frequency ratio 5:4 are…

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Progressive/travelling waves cause energy to move from the source to
the surroundings.
When a travelling wave is restricted (e.g. a string with fixed ends), it
reflects at each end and forms a standing wave.

Principle of Superposition ­ when 2 or more waves meet their TOTAL
displacement and are the…

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