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Speed of Sound
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Speed of a wave on a string:
T is tension sometimes listed as F for force on string. m is the density of the string mass/length
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and f = v/l If wavelength is fixed, how does frequency change if v goes up? Goes up Goes down BORING – lost everyone very quickly.
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and f = v/l If wavelength is fixed, how does frequency change if v goes up? Goes up Goes down If the string is fatter - bigger m, does the speed go up or down? Goes up Goes down
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and f = v/l If wavelength is fixed, how does frequency change if v goes up? Goes up Goes down If the string is fatter - bigger m, does the speed go up or down? Goes up Goes down So, the frequency for a fatter string of the same length is? Lower higher
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and f = v/l If wavelength is fixed, how does frequency change if v goes up? Goes up Goes down If you tighten a string, the speed Goes up Goes down
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and f = v/l If wavelength is fixed, how does frequency change if v goes up? Goes up Goes down If you tighten a string, the speed Goes up Goes down So, the frequency for a tighter string of the same length is? Lower higher
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f = v/l 1st harmonic l1 = 2L 2nd harmonic l2 = L
3rd harmonic l3 = 2/3L 4th harmonic l4 = 1/2L Nth harmonic ln = 2L/n so f = nv/(2L)
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In air If the air is hotter, is the speed of sound Faster slower
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In air If the air is hotter, is the speed of sound Faster Slower
Does hotter air have more collisions or less than colder air? More less
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In air If the air is hotter, is the speed of sound Faster Slower
Does hotter air have more collisions or less than colder air? More less
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V2 = rigidity Inertia Material Speed of sound Air (0oC) 331 m/s
More collisions hydrogen 1290 m/s Less inertia Water 1490 m/s More collisions than gas Aluminum 5100 m/s Lead 1320 m/s Lots of inertia Rubber 54 m/s Very elastic
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