Chapter 17: Q7CQ (page 628)
When you hear a sonic boom, you often cannot see the plane that made it. Why is that?
We cannot see the plane because speed of the plane was greater than the speed of sound.
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Due to efficiency considerations related to its bow wake, the supersonic transport aircraft must maintain a cruising speed that is a constant ratio to the speed of sound (a constant Mach number). If the aircraft flies from warm air into colder air, should it increase or decrease its speed? Explain your answer.
Question: (a) What is the intensity of a sound that has a level \(7.00\;{\rm{dB}}\) lower than a\(4.00 \times {10^{ - 9}}\;{\rm{W/}}{{\rm{m}}^{\rm{2}}}\)sound? (b) What is the intensity of a sound that is \(3.00\;{\rm{dB}}\)higher than a \(4.00 \times {10^{ - 9}}\;{\rm{W/}}{{\rm{m}}^{\rm{2}}}\)sound?
The ear canal resonates like a tube closed at one end. (SeeFigure\(17.39\).) If ear canals range in length from\(1.80\)to\(2.60\;{\rm{cm}}\)in an averagepopulation, what is the range of fundamental resonant frequencies? Takeair temperature to be\(37.0{\rm{^\circ C}}\), which is the same as body temperature.How does this result correlate with the intensity versus frequency graph(Figure\(17.37\)of the human ear?
(a) Find the length of an organ pipe closed at one end that produces a fundamental frequency of 256 Hz when air temperature is18.0C. (b)What is its fundamental frequency at 25.0 C?
What is the difference between an overtone and a harmonic? Are all harmonics overtones? Are all overtones harmonics?
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