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Frequency and Pitch A pitch is the highness or lowness of a sound. The pitch you hear depends on the frequency of the sound waves.
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Waves and SoundsWaves and Sounds
Ch. 18Ch. 18
Frequency and PitchFrequency and Pitch A A pitch pitch is the is the
highness or highness or lownesslowness of a sound. of a sound.
The pitch you hear The pitch you hear depends on the depends on the frequencyfrequency of the of the sound waves.sound waves.
Frequency and PitchFrequency and Pitch The The higher higher the frequency, the the frequency, the higherhigher
the pitch.the pitch.
Healthy Human Ear can hear from Healthy Human Ear can hear from 200 Hz to 20,000 Hz.200 Hz to 20,000 Hz.
Frequency and PitchFrequency and Pitch 2 kinds of waves 2 kinds of waves
we can’t hear:we can’t hear:
Ultrasonic wavesUltrasonic waves – – frequency above frequency above 20,000 Hz20,000 Hz• Used in Used in sonarsonar as as
well as in medical well as in medical diagnosis and diagnosis and treatmenttreatment
Frequency and PitchFrequency and Pitch Infrasonic wavesInfrasonic waves – –
frequency below frequency below 20 Hz20 Hz• Produced by Produced by
heavy machinery heavy machinery or or thunderthunder…you …you can feel it can feel it rumble in your rumble in your body but not body but not actually hear itactually hear it
Intensity and LoudnessIntensity and Loudness IntensityIntensity of a sound of a sound
wave depends on the wave depends on the amount of energyamount of energy in in each wave.each wave.• This corresponds to a This corresponds to a
wave’s wave’s amplitudeamplitude..• As intensity of a As intensity of a
sound wave sound wave increasesincreases, the , the amplitude amplitude increasesincreases..
Intensity and LoudnessIntensity and Loudness LoudnessLoudness is the is the
human perceptionhuman perception of sound intensity.of sound intensity.
• Measured in Measured in decibelsdecibels (dB). (dB).
Doppler EffectDoppler Effect An An increase or increase or
decreasedecrease in in wave wave frequencyfrequency, , caused by caused by motion motion of the of the source and/or source and/or motion of the motion of the observer.observer.
Doppler EffectDoppler EffectNot Moving
Moving
Higher fSmaller Higher pitch
Lower fHigher Lower pitch
Doppler EffectDoppler Effect
What is music?What is music? NoiseNoise has has no set no set
patternpattern and no and no definite pitch.definite pitch.
MusicMusic has a has a regular regular patternpattern, created , created using using specific specific pitchespitches and sound and sound quality.quality.