Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Chapter 23, Problem 59SP
Two cars are heading straight at each other with the same speed. The horn of one
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A dolphin swims directly at a reef in the water of low visibility, using its echolocation by sending out sound ahead of it at a frequency of 1900Hz. The combination of the emitted sound and the echoed sound produces “beats” that the dolphin hears 8 times per second.Find the speed of the dolphin. The speed of sound in sea water is approximately 1550 m/s.
An osprey (a type of hawk) has a distinct call: a whistle at 2100 Hz. An osprey calls while diving at you — you’ve gotten too close to her nest and she wants to drive you away! The frequency you perceive is 2400 Hz. How fast is the osprey approaching? (The speed of sound in air varies with temperature, but in this problem you can take it to be 343 m/s, the speed at 20◦C.)
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Chapter 23 Solutions
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
Ch. 23 - 22. Three seconds after a gun is fired, the person...Ch. 23 - 23. What is the speed of sound in air when the air...Ch. 23 - 24. A longitudinal wave with a frequency of 100 Hz...Ch. 23 - 25. If the speed of sound in air is found to be...Ch. 23 - 26. An autofocusing camera sends out a pulse of...Ch. 23 - 27. It’s often claimed that for every second of...Ch. 23 - 28. A shell fired at a target 800 m away was heard...Ch. 23 - 29. In an experiment to determine the speed of...Ch. 23 - 23.30 [II] A disk has 40 holes around its...Ch. 23 - 23.31 [I] The bulk modulus of seawater is 2.1 GPa....
Ch. 23 - 32. Use Eq. (23.2) to determine the approximate...Ch. 23 - 33. Compute the speed of sound in helium gas at...Ch. 23 - 23.34 [II] Determine the speed of sound in carbon...Ch. 23 - 23.35 [II] Compute the molecular mass M of a gas...Ch. 23 - 23.36 [II] At S.T.P., the speed of sound in air is...Ch. 23 - Prob. 37SPCh. 23 - 23.38 [II] A bar of dimensions and mass 2.00 kg...Ch. 23 - 39. Find the speed of compression waves in a metal...Ch. 23 - Prob. 40SPCh. 23 - 23.41 [I] The level of normal speech exchanged...Ch. 23 - 42. The threshold of human hearing is an intensity...Ch. 23 - 23.43 [II] A machine produces a sound level of 80...Ch. 23 - 44. Suppose the intensity of sound increases by a...Ch. 23 - 45. If the intensity level of sound is to be...Ch. 23 - 46. Suppose we add ±3.0 dB to the intensity level...Ch. 23 - 23.47 [I] If the intensity of sound changes, the...Ch. 23 - 23.48 [I] Redo Problem 23.45 using Eq. (23.9).
Ch. 23 - 49. A sound has an intensity of 5.0 × 10−7 W/m2....Ch. 23 - 50. A person riding a power mower may be subjected...Ch. 23 - 23.51 [II] A rock band might easily produce a...Ch. 23 - 23.52 [II] A whisper has an intensity level of...Ch. 23 - 23.53 [II] What sound intensity is 3.0 dB louder...Ch. 23 - 23.54 [II] Calculate the intensity of a sound wave...Ch. 23 - 23.55 [II] What is the amplitude of vibration in a...Ch. 23 - 23.56 [II] One sound has an intensity level of...Ch. 23 - 23.57 [II] An organ pipe is tuned to emit a...Ch. 23 - 23.58 [I] A locomotive moving at 30.0 m/s...Ch. 23 - 23.59 [II] Two cars are heading straight at each...Ch. 23 - 23.60 [II] To determine the speed of a harmonic...Ch. 23 - 23.62 [II] The two sources shown in Fig. 23-4 emit...
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- If a stationary dolphin emits a call at a sound frequency of 53 kHz. The sound wave reflects off a fish moving directly towards the dolphin. And the sound wave echo returns at a frequency of 55 kHz. What is the speed of the fish? The speed of sound is 343 m/s.arrow_forwardAn enormous thunderstorm covers Dallas-Ft. Worth. Your best friend Clark is a storm chaser and heads to the center of the storm to take some readings while you stay dry at home. While Clark is at the center of the storm, he sees and hears lightning strike a tree that is 150 m from where he is standing. You are 132 km from the tree. How long does it take for the sound to reach Clark? Assume the speed of sound is 343 m/s. How long does it take for the light to reach you? Sarrow_forwardYou are standing on a train station platform as a train goes by close to you. As the train approaches, you hear the whistle sound at a frequency of f1 = 93 Hz. As the train recedes, you hear the whistle sound at a frequency of f2 = 75 Hz. Take the speed of sound in air to be v = 340 m/s. (a) Find an equation for the speed of the sound source vs, in this case it is the speed of the train. Express your answer in terms of f1, f2, and v. (b) Find the numeric value, in meters per second, for the speed of the train. (c) Find an equation for the frequency of the train whistle fs ("s" is for "source") that you would hear if the train were not moving. Express your answer in terms of f1, f2, and v. (d) Find the numeric value, in hertz, for the frequency of the train whistle fs that you would hear if the train were not moving.arrow_forward
- An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. The speeds of sound in air, water, and the handrail are 342, 1400, and 5140 m/s, respectively. The sound travels a distance of 136 m in each medium. (a) After the first sound arrives, how much later does the second sound arrive? (b) After the first sound arrives, how much later does the third sound arrive?arrow_forwardAn explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. The speeds of sound in air, water, and the handrail are 346, 1400, and 5480 m/s, respectively. The sound travels a distance of 142 m in each medium. (a) After the first sound arrives, how much later does the second sound arrive? (b) After the first sound arrives, how much later does the third sound arrive? (a) Number i (b) Number i Units Unitsarrow_forwardA dolphin swims directly at a reef in water of low visibility, using its echolocation by sending out sound ahead of it at a frequency of 1800 Hz. The combination of the emitted sound and the echoed sound produces “beats” that the dolphin hears 5 times per second. Find the speed of the dolphin. The speed of sound in sea water is approximately 1500 m/s.arrow_forward
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