2. Loudness is a physiological sensation sensed by the brain. Loudnessvaries nearly as the logarithm of intensity. The unit of intensity for soundis the decibel (dB) named after Alexander Graham Bell, inventer of thetelephone. Referencing the table below listing some common sourcesand sound levels answer the following questions: a) What is thedifference in decibels between the sound level of a close whisper andbusy street traffic? b) By what factor is the sound intensity of the busystreet than that of the close whisper? c). How much more intense isnormal speech than a close whisper ? d). How much more intense is thethreshold of pain than busy street traffic. e) The signal to noise ratio fora tape recorder is listed at 50 dB, by what factor is the sound intensity ofthe music greater than that of the noise?Table 26.1Source ofLevel (dB)SoundJet engine, at 30 m140Threshold of pain120Loud rock music115Old subway train100Average factory90Busy street traffic70Normal speech60Library40Close whisper20

a) Busy street traffic = 70 dB Close whisper = 20 dB=70-20=50 dBb) Factors on which loudness of…

Answered: 2. Loudness is a physiological…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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The highest frequency sound humans can hear is about 20,000 HzHz. 1. What is the wavelength of sound in air at this frequency? 2. What is the wavelength of the lowest sounds we can hear, about 20 HzHz?
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.Negative decibels? Our discussion of decibels did not mention that they can be negative. On the Redmond, Washington campus of Microsoft is an anechoic chamber that, according to Guinness World Records, is the quietest place in the world. It measures –20.3 decibels. a. What is the relative intensity of a sound measuring –1 decibels? Round your answer to one decimal place. b. What is the relative intensity of a sound measuring –10 decibels? Round your answer to one decimal place. c. What is the relative intensity of Microsoft's anechoic chamber? Round your answer to three decimal places. d. Is it possible for the relative intensity to actually be zero?
3 rces The sound of normal breathing is not very loud, with an intensity of about 11 dB at a distance of 1 m away from the face of the breather. Note that in this problem sound intensity in decibels is denoted 3; intensity in W/m² is denoted I View Available Hint(s) distance Ddetect in meters. Ddetect = 3.16 m Submit Previous Answers ✓ Correct Part B In general, if a sound has intensity of 3 dB at 1 m from the source, at what distance de from the source would the decibel level decrease to 0 dB? Since the limit of hearing is 0 dB this would mean you could no longer hear it. Express the distance in terms of B. Be careful about your signs! View Available Hint(s) Submit IVE] ΑΣΦ do 3.55 3 Previous Answers X Incorrect; Try Again; 5 attempts remaining < Return to Assignment Provide Feedback P Pearson m Copyright © 2022 Pearson Education Inc. All rights reserved. | Terms of Use | Privacy Policy | Permissions | Contact Us |
1. The noise from a power mower was measured at 109 dB. The noise level at a rock concert was measured at 118 dB. Find the ratio of the intensity of the rock music to that of the power mower. (Round your answer to the nearest whole number.) 2. The decibel level of the sound of a subway train was measured at 98 dB. Find the intensity in watts per square meter (W/m2). (Give your answer in scientific notation, correct to one decimal place.) (blank) × 10(blank) W/m2
A bat flying in a cave emits a sound pulse and receives an echo in 1 second. Using a speed of sound of 340 m/s a) Draw a sketch of the scenario. b) Use your sketch to determine how far away is the cave wall?
_" is used to designate sound waves with frequencies a. The word "_ greater than 20 000 Hz. b. A high frequency of a sound wave is perceived as a high-pitched. c. Even if two sounds have the same pitch, the makes it possible to distinguish when they are produced by different instruments (e.g., a piano and a guitar). d. in physics usually refers to longitudinal waves of pressure within the audible range propagating in a solid, liquid, or gas, although it can extend to other intervals. e. The term 7 represented with a I in the equations, is used to describe the energy that is propagated in traveling waves. f. The is a perceived characteristic of the sound wave related to its amplitude.
t is a typical 0 celsius winter day. A. state the speed of sound. B. state the frequency range between infrasound and ultrasound for a typical person on this day. C. Determine the wave length of the longest and shortest wavelength a human ear can detect on this winter day.
An ambulance with a siren emitting a whine at 1550 Hz overtakes and passes a cyclist pedaling a bike at 2.25 m/s. After being passed, the cyclist hears a frequency of 1538 Hz. How fast is the ambulance moving? (Take the speed of sound in air to be 343 m/s.) Number i Units
Choose correct one.
3.Which graph shows a linear relationship? The frequency is linear when plotted as a function of inverse length (ff vs. 1/L1/L). The frequency is linear when plotted as a function of length (ff vs. LL). 4.Draw a best-fit line through the linear graph’s data, and use the slope of this line to determine the wave speed. Express your answer in meters per second to two significant figures.
Which of the following statements are true? Which one or more? a. The pitch of the voice is affected by the amplitude of vibration of the vocal cords, but not by frequency dependent acoustic resonance. b. D The low frequency range which contains the consonants is more important for understanding speech than the high frequency range from about 1 k Hz to 5 k Hz which contains the vowels. c. The high frequency range from about 1 k Hz to 5 k Hz which contains the consonants is more important for understanding speech than the low frequency range which contains the vowels. d. The pitch of speech sounds is produced by articulation or movement of the tongue, lips, lower jaw and soft palate to modify the airflow.

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