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Chapter 12: Q1MCQ (page 328)
Do you expect an echo to return to you more quickly on a hot day or a cold day?
(a) Hot day.
(b) Cold day.
(c) Same on both days.
The correct option is (a).
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Question: Two loudspeakers are at opposite ends of a railroad car as it moves past a stationary observer at\({\bf{12}}{\bf{.0}}\,{\bf{m/s}}\), as shown in Fig. 12–41. If the speakers have identical sound frequencies of \({\bf{348}}\,{\bf{Hz}}\), what is the beat frequency heard by the observer when (a) he listens from position A, in front of the car, (b) he is between the speakers, at B, and (c) he hears the speakers after they have passed him, at C?
Fig. 12-41
What is the sound level of a sound whose intensity is\(1.5 \times {10^{ - 6}}\;{\rm{W/}}{{\rm{m}}^2}\)?
Question :(I) If you were to build a pipe organ with open-tube pipes spanning the range of human hearing (20 Hz to 20 kHz), what would be the range of the lengths of pipes required?
(a) At \(T{\bf{ = 22^\circ C}}\) how long must an open organ pipe be to have a fundamental frequency of \({\bf{294}}\;{\bf{Hz}}\)? (b) If this pipe is filled with helium, what is its fundamental frequency?
A supersonic jet traveling at Mach 2.0 at an altitude of 9500 m passes directly over an observer on the ground. Where will the plane be relative to the observer when the latter hears the sonic boom? (See Fig. 12-39.)
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