03 Physics of Sound- Wave length and resonance
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| period of a sound | show 🗑
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| wavelength | show 🗑
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| show | 1130 feet per second (344 meters per second)
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| show | 1130 feet/sec 1000 cycles/sec= 1.13 ft (wave length)
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| show | =Speed of sound/ frequency of wave (aka # of cycles/sec)
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| show | 1130 feet-sec/ 2000 cycles-sec = 0.565 ft.
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| What is the correlation between wave length and frequency? | show 🗑
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| show | 1130 ft-s /250 cycles-s= 4.52 ft
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| What is the wavelength of a 6000 Hz tone? | show 🗑
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| What is the wavelength of a 500 Hz tone? | show 🗑
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| show | 1130 ft-s/2.825 ft= 400Hz
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| show | 1130/9.04= 125 Hz
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| show | 1130/5.6= 200Hz
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| show | 1) Find frequency- 1s/.0002s= 5000 HZ
2) Find wave length- 1130/5000=0.226 ft
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| Resonance | show 🗑
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| Echo | show 🗑
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| Reverberation & Resonance- | show 🗑
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| show | -As the enclosure becomes smaller, the sound energy bounces around much more rapidly within the container causing it to “ring”
-When the enclosure reaches a certain smallness, its “ringing” will dominate the sound source, reverberation becomes resonance
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| show | fuller
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| show | seem louder, more intense
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| Low frequency notes reverbertae in what type of containers? | show 🗑
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| show | short
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| A tube, open at one end, rings best (resonates) | show 🗑
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| At what frequencies will a 1ft, open ended tube resonate? | show 🗑
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| show | 1) WL= 4x length of tube- 4x3= 12ft
2) 1130 ft-sec/12 ft= 94.17 HZ (freq)
This tube will resonant at 94.17 Hz and at odd number multiples of this frequency
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| At what frequencies will a 5 ft, open ended tube resonate? | show 🗑
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| What is the length of a tube that has a primary resonance of 4000 Hz? | show 🗑
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| What is the length of a tube that has a primary resonance of 750 Hz? | show 🗑
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