Question

A. What is the intensity in 10^{-4} watts per meter
squared of 112 dB sound?

B.A spectator at a parade receives an 886 Hz tone from an oncoming trumpeter who is playing an 863 Hz note. At what speed is the musician approaching if the speed of sound is 336 m/s?

C. What frequency is received by a person watching an ambulance moving away at 89 km/h and emitting a steady 774 Hz sound from its siren? The speed of sound on this day is 346 m/s.

D.What is the fundamental frequency of a 0.564 m long tube, open at both ends, on a day when the speed of sound is 334 m/s?

E.If a wind instrument, such as a tuba, has a fundamental frequency of 37.5 Hz, what is its fifth overtone? It is closed at one end and the speed of sound is 330 m/s.

Answer #1

Solution in the uploaded images

1. A spectator at a parade receives an 907 Hz tone from an
oncoming trumpeter who is playing an 877 Hz note. At what speed is
the musician approaching if the speed of sound is 345 m/s?
2. If a wind instrument, such as a tuba, has a fundamental
frequency of 34.6 Hz, what is its fifth overtone? It is closed at
one end and the speed of sound is 331 m/s.
3. A sonar echo returns to a submarine...

A. What length should an oboe have to produce a fundamental
frequency of 244 Hz on a day when the speed of sound is 343 m/s? It
is open at both ends.
B. What frequency is received by a person watching an oncoming
ambulance moving at 119 km/h and emitting a steady 706 Hz sound
from its siren? The speed of sound on this day is 333 m/s.
C. What energy in millijoules falls on a 0.808 cm diameter
eardrum...

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