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A pair of die-hard sports fans decide to ride their motorcycle to the local game, equipped with identical air horns.

A pair of die-hard sports fans decide to ride their motorcycle to the local game, equipped with identical air horns. While stuck at a stoplight, one rider blasts his horn, emmiting a coninuous sound at a frequency of 10 rads/sec. The second rider waits just the right amount of time before also blasting his horn, so that the two sound waves are exactly π/6 radians out of phase (you can take the speed of sound in air to be v = 343 m/s, and the density of air to be 1.2 kg/m3).

a) If the sound level of each horn is 100 dB, what is the intensity of the total sound from the two horns? Express your answer as a numerical value in units W/m2.

b) If the light turns green and the bike then speeds off at 100 m/s with the horns still blaring, what apparent frequency is heard by a person left standing by the intersection?


Top Answer

a)sqrt(100^2+100^-2*100*100*cos(pi/3))=100 dB b)velocity of... View the full answer

2 comments
  • the answer is incomplete and appears incorrect, please do not use
    • pbpm7
    • Apr 28, 2016 at 2:57am
  • @am_moderator please clarify
    • pbpm7
    • Apr 28, 2016 at 3:17am

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