EBK PHYSICS
5th Edition
ISBN: 8220103026918
Author: Walker
Publisher: PEARSON
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Chapter 14, Problem 89GP
BIO Measuring Hearing Loss To determine the amount of temporary hearing loss loud music can cause in humans, researchers studied a group of 20 adult females who were exposed to 110-dB music for 60 minutes. Eleven of the 20 subjects showed a 20.0-dB reduction in hearing sensitivity at 4000 Hz. What is the intensity corresponding to the threshold of hearing for these subjects?
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You work at a building site and the noise level has been measured at 95 dB. You need to wear earplugs rated to reduce the sound intensity by 32 dB. If your eardrum has a diameter of 8.4 mm, what is the power received by one eardrum after you put in an earplug.
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Hint: The threshold of human hearing is Io = 1.00 x 10-12 W/m2.
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Chapter 14 Solutions
EBK PHYSICS
Ch. 14.1 - Rank the following systems in order of increasing...Ch. 14.2 - Suppose the tension in a string is doubled, its...Ch. 14.3 - A particular harmonic wave is described by the...Ch. 14.4 - Which is faster: wave 1 in medium 1 with a...Ch. 14.5 - Enhance Your Understanding (Answers given at the...Ch. 14.6 - Observer 1 approaches a stationary 1000-Hz source...Ch. 14.7 - Prob. 7EYUCh. 14.8 - When a string oscillates with the standing wave...Ch. 14.9 - Rank the following systems in order of increasing...Ch. 14 - A long nail has been driven halfway into the side...
Ch. 14 - What type of wave is exhibited by amber waves of...Ch. 14 - In a classic TV commercial, a group of cats feed...Ch. 14 - Describe how the sound of a symphony played by an...Ch. 14 - A radar gun is often used to measure the speed of...Ch. 14 - When you drive a nail into a piece of wood, you...Ch. 14 - Explain the function of the sliding part of a...Ch. 14 - On a guitar, some strings are single wires, others...Ch. 14 - Prob. 9CQCh. 14 - A wave travels along a stretched horizontal rope....Ch. 14 - To determine: The speed of the waves Answer: The...Ch. 14 - The speed of surface waves in water decreases as...Ch. 14 - Prob. 4PCECh. 14 - A stationary boat bobs up and down with a period...Ch. 14 - Predict/Calculate A 4.5-Hz wave with an amplitude...Ch. 14 - Deepwater Waves The speed of a deepwater wave with...Ch. 14 - Prob. 8PCECh. 14 - Consider a wave on a string with constant tension....Ch. 14 - Suppose you would like to double the speed of a...Ch. 14 - Predict/Explain Two strings are made of the same...Ch. 14 - Predict/Explain Two strings are made of the same...Ch. 14 - Prob. 13PCECh. 14 - A brother and sister try to communicate with a...Ch. 14 - Predict/Calculate (a) Suppose the tension is...Ch. 14 - Prob. 16PCECh. 14 - A 4.5-m-long rope of mass 1.8 kg hangs from a...Ch. 14 - Two steel guitar strings have the same length....Ch. 14 - Use dimensional analysis to show how the speed v...Ch. 14 - Prob. 20PCECh. 14 - Write an expression for a transverse harmonic wave...Ch. 14 - The vertical displacement of a wave on a string is...Ch. 14 - As it travels through a crystal, a light wave is...Ch. 14 - Predict/Calculate A wave on a string is described...Ch. 14 - Consider a harmonic wave with the following wave...Ch. 14 - Predict/Calculate Four waves are described by the...Ch. 14 - To determine: The distance of the cliff form the...Ch. 14 - BIO Dolphin Ultrasound Dolphins of the open ocean...Ch. 14 - Prob. 29PCECh. 14 - Prob. 30PCECh. 14 - Predict/Calculate A sound wave in air has a...Ch. 14 - Prob. 32PCECh. 14 - A rock is thrown downward into a well that is 7.62...Ch. 14 - If the distance to a point source of sound is...Ch. 14 - The intensity level of sound in a truck is 88 dB....Ch. 14 - Prob. 36PCECh. 14 - Sound 1 has an intensity of 48.0 W/m2. Sound 2 has...Ch. 14 - Prob. 38PCECh. 14 - Residents of Hawaii are warned of the approach of...Ch. 14 - In a pig-calling contest, a caller produces a...Ch. 14 - Prob. 41PCECh. 14 - BIO The Human Eardrum The radius of a typical...Ch. 14 - Predict/Explain A horn produces sound with...Ch. 14 - You are heading toward an island in your speedboat...Ch. 14 - When the bell in a clock tower rings with a sound...Ch. 14 - A car approaches a train station with a speed of...Ch. 14 - BIO A bat moving with a speed of 3.25 m/s and...Ch. 14 - A motorcycle and a police car are moving toward...Ch. 14 - Hearing the siren of an approaching fire truck,...Ch. 14 - Prob. 50PCECh. 14 - Predict/Calculate Two bicycles approach one...Ch. 14 - A train on one track moves in the same direction...Ch. 14 - Two cars traveling with the same speed move...Ch. 14 - The Bullet Train The Shinkansen, the Japanese...Ch. 14 - Prob. 55PCECh. 14 - Prob. 56PCECh. 14 - A pair of in-phase stereo speakers is placed side...Ch. 14 - Predict/Calculate Two violinists, one directly...Ch. 14 - Two loudspeakers are placed at either end of a...Ch. 14 - Prob. 60PCECh. 14 - Prob. 61PCECh. 14 - Prob. 62PCECh. 14 - An organ pipe that is open at both ends is 3.5 m...Ch. 14 - A string 2.5 m long with a mass of 3.6 g is...Ch. 14 - Prob. 65PCECh. 14 - The fundamental wavelength for standing sound...Ch. 14 - A string is tied down at both ends. Some of the...Ch. 14 - Prob. 68PCECh. 14 - A guitar string 66 cm long vibrates with a...Ch. 14 - Predict/Calculate A guitar string has a mass per...Ch. 14 - Prob. 71PCECh. 14 - The organ pipe in Figure 14-49 is 2.75 m long. (a)...Ch. 14 - The frequency of the standing wave shown in Figure...Ch. 14 - An organ pipe open at both ends has a harmonic...Ch. 14 - When guitar strings A and B are plucked at the...Ch. 14 - Prob. 76PCECh. 14 - You have three tuning forks with frequencies of...Ch. 14 - Tuning a Piano To tune middle C on a piano, a...Ch. 14 - Two musicians are comparing their clarinets. The...Ch. 14 - Predict/Calculate Two strings that are fixed at...Ch. 14 - Identical cellos are being tested. One is...Ch. 14 - A friend in another city tells you that she has...Ch. 14 - Prob. 83GPCh. 14 - The fundamental of an organ pipe that is closed at...Ch. 14 - The Loudest Animal The loudest sound produced by a...Ch. 14 - Hearing a Good Hit Physicist Robert Adair, once...Ch. 14 - Prob. 87GPCh. 14 - Playing Harmonics When a 63-cm-long guitar string...Ch. 14 - BIO Measuring Hearing Loss To determine the amount...Ch. 14 - BIO Hearing a Pin Drop The ability to hear a pin...Ch. 14 - A cannon 105 m away from you shoots a cannonball...Ch. 14 - A machine shop has 120 equally noisy machines that...Ch. 14 - Predict/Calculate A bottle has a standing wave...Ch. 14 - Speed of a Tsunami Tsunamis can have wavelengths...Ch. 14 - Two trains with 124-Hz horns approach one another....Ch. 14 - Predict/Calculate Jim is speeding toward James...Ch. 14 - Two ships in a heavy fog are blowing their horns,...Ch. 14 - BIO Cracking Your Knuckles When you crack a...Ch. 14 - A steel guitar string has a tension F, length L,...Ch. 14 - A Slinky has a mass of 0.28 kg and negligible...Ch. 14 - BIO Predict/Calculate OSHA Noise Standards OSHA,...Ch. 14 - An organ pipe 3.4 m long is open at one end and...Ch. 14 - Two identical strings with the same tension...Ch. 14 - BIO The Love Song of the Midshipman Fish When the...Ch. 14 - Prob. 105GPCh. 14 - Beats and Standing Waves In Problem 59, suppose...Ch. 14 - Prob. 107PPCh. 14 - Prob. 108PPCh. 14 - Prob. 109PPCh. 14 - Prob. 110PPCh. 14 - Prob. 111PPCh. 14 - Referring to Example 14-11 Suppose the train is...Ch. 14 - Prob. 113PPCh. 14 - Prob. 114PP
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- Ever since seeing Figure 16.22 in the previous chapter, you have been fascinated with the hearing response in humans. You have set up an apparatus that allows you to determine your own threshold of hearing as a function of frequency. After performing the experiment and recording the results, you graph the results, which look like Figure P17.22. You are intrigued by the two dips in the curve at the right-hand side of the graph. You measure carefully and find that the minimum values of these dips occur at 3 800 Hz and 11 500 Hz. Performing some online research, you discover that the outer canal of the human ear can be modeled as an air column open at the outer end and closed at the inner end by the eardrum. You use this information to determine the length of the outer canal in your car. Figure P17.22arrow_forwardBased on the graph in Figure 17.36, what is the threshold of hearing in decibels for frequencies of 60, 400, 1000, 4000, and 15,000 Hz? Note that many AC electrical appliances produce 60 Hz, music is commonly 400 Hz, a reference frequency is 1000 Hz, your maximum sensitivity is near 4000 Hz, and many older TVs produce a 15,750 Hz whine. Figure 17.36 The relationship of loudness in phons to intensity level (in decibels) and intensity (in watts per meter squared) for persons with normal hearing. The curved lines are equal-loudness curves—all sounds on a given curve are perceived as equally loud. Phons and decibels are defined to be the same at 1000 Hz.arrow_forwardWhy can a hearing test show that your threshold of hearing is 0 dB at 250 Hz, when Figure 17.37 implies that no one can hear such a frequency at less than 20 dB? Figure 17.37 The shaded region represents frequencies and intensity levels found in normal conversational speech. The O-phon line represents the normal hearing threshold, while those at 40 and 60 represent thresholds for people with 40- and 60-phon hearing losses, respectively.arrow_forward
- A sound wave traveling in air has a pressure amplitude of 0.5 Pa. What is the intensity of the wave?arrow_forwardSound is detected when a sound wave causes the tympanic membrane (the ear drum) to vibrate. Typically, the diameter of this membrane is about 8.4 mm in humans. A) how much energy is delivered to the eardrum each second when someone whispers (20 dB) into your ear? B) to comprehend how sensitive the ear is to very small amounts of energy, calculate how fast a typical 2.0 mg mosquito would have to fly (in mm/s) to have this amount of kinetic energy.arrow_forwardThe area of a typical eardrum is approximately 5.0 x 10°m². Calculate the sound power on the eardrum at: (Intensity = Power/Area) a. The threshold of hearing. b. The threshold of pain.arrow_forward
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- The table gives an estimate for the sound intensity of a whisper at 1.0 m. What is the sound intensity of a whisper at a distance of 3.5 m, in W/m2 ? Express your answer in watts per meter squared. What is the corresponding sound intensity level in dB ? Express your answer in decibels.arrow_forwardThe area of a typical eardrum is about 5.00 × 10-5 m². (a) Calculate the average sound power incident on an eardrum at the threshold of pain, which corresponds to an intensity of 1.00 W/m2. w (b) How much energy is transferred to the eardrum exposed to this sound for 4.20 min? Additional Materials O eBookarrow_forwardA threshold of hearing has an intensity of 10- 12 W/m^2 (a sound level of 0Db). how much more intense than the threshold of hearing is a sound of 10 DB? The threshold of hearing has an intensity of 10^-12 w/m^2 how much more intense than the threshold of hearing is a sound of 40db?arrow_forward
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