2. Speaker A is playing a sound with double the intensity of Speaker B. How muchlouder is Speaker A than Speaker B?3. Speaker A is playing a sound with a quarter of the amplitude of Speaker B. Howmuch louder is Speaker A than Speaker B?5. What is the impedance of a wave with a speed of 243m/s and a density of 3.2 kg/m3.

Loudness is related to the amplitude of the sound waves whereas intensity is the rate at which power…

Answered: 2. Speaker A is playing a sound with…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter17: Physics Of Hearing

Section: Chapter Questions

Problem 25PE: If a sound intensity level of 0 dB at 1000 Hz corresponds to a maximum gauge pressure (sound...

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1a. A speaker is playing music at 4.3 W. What is the intensity of the music if the speaker is 0.5 m away from you? 1b. What is the loudness of this speaker? Speaker A is playing a sound with double the intensity of Speaker B. How much louder is Speaker A than Speaker B? Speaker A is playing a sound with a quarter of the amplitude of Speaker B. How much louder is Speaker A than Speaker B? What is the impedance of a wave with a speed of 243m/s and a density of 3.2 kg/m3. What is the ratio of impedance when Z1 = 3.2 x 103 and Z2 = 1.45 x 102 ? 7a. The ratio of impedance of two substances is 7. What percentage of intensity is transmitted at the boundary? 7b. What percentage of intensity is reflected?
1- The higher acoustic impedance is between two media, the .................. the echo amplitude is a. smaller b. brighter c. shallower d. higher
(III) Expensive amplifier A is rated at 220 W, while the moremodest amplifier B is rated at 45 W. (a) Estimate the soundlevel in decibels you would expect at a point 3.5 m from aloudspeaker connected in turn to each amp. (b) Will theexpensive amp sound twice as loud as the cheaper one?
2. Explain why we cannot hear the sound frequency below the limit?
Assume a 150 W loudspeaker broadcasts sound equally in all directions and produces sound with a level of 103 dB at a distance of 1.60 m from its center. (a) Find its sound power output. If a salesperson claims the speaker is rated at 150. W, he is referring to the maximum electrical power input to the speaker. (b) Find the efficiency of the speaker, that is, the fraction of input power that is converted into useful output power.
If a sound intensity level of 0 dB at 1000 Hz corresponds to a maximum gauge pressure (sound amplitude) of 109 atm, what is the maximum gauge pressure in a 60dB sound? What is the maximum gauge pressure in a 120dB sound?
How can you determine that the speed of sound is the same for all frequencies by listening to a band orchestra?
In the clinical use of ultrasound, transducers are always coupled to the skin by a thin layer at gel or oil, replacing the air that would otherwise exist between the transducer and the skin. (a) Using the values of acoustic impedance given in Table 17.5 calculate the intensity refiection coef?cient between transducer material and air. (b) Calculate the intensity refiection coefficient between transducer material and gel (assuming for this problem that its acoustic impedance is identical to that of water). (c) Based on the results at your calculations, explain why the gel is used.
What frequency is received by a mouse just before being dispatched by a hawk flying at it at 25.0 m/s and emitting a screech of frequency 3500 Hz? Take the Speed of sound to be 331 m/s.
What sound intensity levels must sounds of frequencies 60,3000, and 8000 Hz have in order to have the same loudness as a 40dB sound of frequency 1000 Hz (that is, to have a loudness of 40 phons)?
Assume a 150 W loudspeaker broadcasts sound equally in all directions and produces sound with a level of 103 dB at a distance of 1.60 m from its center. (a) Find its sound power output. If a salesperson claims the speaker is rated at 150. W, he is referring to the maximum electrical power input to the speaker. (b) Find the efficiency of the speaker, that is, the fraction of input power that is converted into useful output power.
Orchestra instruments are commonly tuned to match an A-note played by the principal oboe. The Baltimore Symphony Orchestra tunes to an A-note at 440 Hz while the Boston Symphony Orchestra tunes to 442 Hz. If the speed of sound is constant at 343 m/s, find the magnitude of difference between the wavelengths of these two different A-notes.

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