Speed of Sound

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

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.

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

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

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

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

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)

In air If the air is hotter, is the speed of sound Faster slower

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

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

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