College Physics
1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: OpenStax College
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Textbook Question
Chapter 17, Problem 11CQ
Why 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.
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Why can a hearing test show that your threshold of hearing is 0 dB at 250 Hz, when Figure 17.36 implies that no one can hear such a frequency at less than 20 dB?
Why can a hearing test show that your threshold of hearing is 0 dB at 250 Hz, when the figure shown implies that no one can hear such a frequency at less than 20 dB?
If a woman needs an amplification of 5.0X1012 times the threshold intensity to enable her to hear at all frequencies, what is her overall hearing loss in dB? Note that smaller amplification is appropriate for more intense sounds to avoid further damage to her hearing from levels above 90 dB.
Chapter 17 Solutions
College Physics
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- Based on the graph shown, 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 4000Hz, and many older TVs produce a 15,750 Hz whine.arrow_forwardA child has an ear canal that is 1.3 cm long. At what sound frequencies in the audible range will the child have increased hearing sensitivity?arrow_forwardAre ultrasound and infrasound imperceptible to all hearing organisms? Explain your answer.arrow_forward
- If a woman needs an amplification of 5.0105 times the threshold intensity to enable her to hear at all frequencies, what is her overall hearing loss in dB? Note that smaller amplification is appropriate for more intense sounds to avoid further damage to her hearing from levels above 90 dB.arrow_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_forwardCheck Your Understanding Identify common sounds at the levels of 10 dB, 50 dB, and 100 dB.arrow_forward
- Suppose a person has a 50-dB hearing loss at all frequencies. By how many factors of 10 will low-intensity sounds need to be amplified to seem normal to this person?Note that smaller amplification is appropriate for more intense sounds to avoid further hearing damage.arrow_forwardA person has a hearing threshold 10 dB above normal at 100 Hz and 50 dB above normal at 4000 Hz. How much more intense must a 100-Hz tone be than a 4000-Hz tone if they are both barely audible to this person?arrow_forwardOne person has a threshold of hearing of 5 dB, and another of 10 dB. Which person has the more acute hearing?arrow_forward
- Does a bass reflex speaker have a SPL and cross over points?arrow_forwardThe lowest pitch that the average canine ear can identify is 40 Hz. If sound with this frequency travels through air with a speed of 300 m/s, how long is the wavelength?arrow_forwardHow does our sensitivity to hearing different frequencies change with intensity? Compare a 1000 Hz sound at 60 dB (conversation level) to a 5000 Hz sound at 32 dB (also conversation level)arrow_forward
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