Sound Waves in Air
longitudinal (compression) waves
v = 344 m/s = 1130 ft/s at 20O C (68OF)
v increases with temperature
(increase 0.6 m/s per degree C = 1 ft/s per deg F).
air pressure does not affect v!
frequency does not affect v!
relevance: pitch of wind instruments changes with v
wave length:
l = v/f
example (homework)
demo
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