Sound. Sound Waves The origin of any sound is a vibrating object –Usually the frequency of the sound is the same as that of the vibrating object Frequency.

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Presentation transcript:

Sound

Sound Waves The origin of any sound is a vibrating object –Usually the frequency of the sound is the same as that of the vibrating object Frequency Range: Sound: 20 Hz – 20,000 Hz Ultrasound: >20,000 Hz Infrasound: < 20 Hz

Forced Vibration & Resonance forced vibration – example -- strike tuning fork and hold the stem against the table sounding board -- used to amplify sound in music boxes and all string resonance -- when the frequency of forced vibrations matches the object's natural frequency, a dramatic increase in amplitude occurs

Speed of Sound depends on wind conditions, temperature, and humidity does NOT depend on loudness or frequency of the sound all sounds travel at the same speed in the same medium in dry air at 0°C ~ 330 m/s (1200 km/h) Sound travels faster through warm air than cold air. In air, v sound = 330 m/s + (0.6 m/s/C o )*T C

Pitch & Loudness Pitch – frequency Double frequency – go up an octave Loudness – amplitude

Decibel Scale incredibly sensitive can hear everything from fingertip brushing lightly over fabric to a loud jet engine sound of jet engine is about times more powerful than smallest audible sound a big difference! decibel scale -- smallest audible sound is 0 dB A sound 10 times more powerful is 10 dB A sound 100 times more powerful than near total silence is 20 dB Decibel Scale is logarithmic

Decibel Levels Near total silence - 0 dB A whisper - 15 dB Normal conversation - 60 dB A lawnmower - 90 dB A car horn dB A rock concert or a jet engine dB A gunshot or firecracker dB

Waves Moving in and Out of Phase When the 2 waves are in phase, the resulting disturbance has a maximum amplitude. When the 2 waves are out of phase, the resulting disturbance has a minimum amplitude.

Beats Waves of slightly different frequencies form a pattern of alternating maximum and minimum amplitude. The packets of maximum amplitude are called beats.

Noise Canceling tiny microphones, one on each earpiece, detect ambient noise before it gets to your ears. noise-cancellation circuitry inverts the captured signal, turning the noise's sound wave upside down. noise-cancellation system adds the sonic opposite of the external noise to whatever you're listening to eliminating most of the pollution and leaving you with just your music.

Standing Waves

Fundamental & Harmonics

To Do Read Chapter 20 Complete Homework 1 due Tues, Jan. 23Homework 1 Remember – NO CLASS ON Thursday, Jan. 18