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L17_14Feb_posted - Physics 6B Standing Waves and Reflection...

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1 Physics 6B Standing Waves and Reflection 2 3 Beat frequency demo http://www.school-for-champions.com/science/sound_beat.htm 4 Wave interference Interference patterns are a hallmark characteristic of waves ! first indication that light is a wave ! that particles behave like waves
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5 Fourier Analysis All waveforms can be written as the sum of sine and cosine waves of different frequencies Continuous, periodic waves can be written as sum of ! a fundamental wave ! and higher harmonics » frequencies are integer multiples of fundamental frequency square wave built out of harmonics 6 Clicker question In the beat frequency demo the combination of the 330Hz and 331Hz tones produced beat tones 1 second apart, and the combination of the 330Hz and 340Hz tones produces beat tones 1/10th second apart. How far apart will the tones produced by the combination of 330Hz and 330.5Hz be? A. .5 seconds B. 20 seconds C. 30 seconds D.
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