Chapter 13: Sound. Camila Enríquez Juliana Borrero. Objective :. Understand the production of sound waves, compare the speed of sound in different situations, and recognize the Doppler effect. Relate frequency to pitch, identify intensity, and decibel level.
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Understand the production of sound waves, compare the speed of sound in different situations, and recognize the Doppler effect.
Relate frequency to pitch, identify intensity, and decibel level.
Approach the perception of loudness, and resonance.
Calculate harmonics and differentiate between the harmonic series of closed and open pipes.
Sound waves are longitudinal. (sine curve)
Frequency determines pitch
Sound waves disperse in 3D
Doppler Effect: relative motion creates a change in frequency.
Intensity in decibels
Length of vibrating string and vibrating air column will affect harmonic series frequencies.
Australian physicist Christian Doppler
The ambulance is moving toward the woman, so the frequency heard by the woman is greater than the ambulance frequency.
When the source that emits the sound (this case the ambulance) is approaching you the wave you receive will be in a higher frecuency (shorter wave lenght). If the source is leaving you, then you will receive a lower frequency wave (longer wavelenght.)
Remember: the speed of sound waves DOES NOT change.