79. A human ear detects sound as a result of fluctuationsin air pressure against the eardrum, which are in turntransmitted into nerve impulses that the brain translatesas sound. Suppose that the pressure P(t) of a soundwave on a person's eardrum from a source 20 ft awayis given by P(t) = 0.02 cos (1000t – 107). In thismodel P(t) is in pounds per square foot and t is thetime in seconds after the sound begins. Simplify theright side by applying the difference formula forcosine.

Answered: 79. A human ear detects sound as a…

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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A sound wave arriving at your ear is transferred to the fluid in the cochlea. If the intensity in the fluid is 0.410 times that in air and the frequency is the same as for the wave in air, what will be the ratio of the pressure amplitude of the wave in air to that in the fluid? Approximate the fluid as having the same values of density and speed of sound as water. Speed of sound in dry air (20.0°C, 1.00 atm) is 343 m/s, density of dry air (at STP) is 1.29 kg/m3, density of water is 1000 kg/m3, and speed of sound in water is 1493 m/s.
3. The VE3KBR transmitter near Tokyo broadcasts on a frequency of 146.940 MHz. The transmitter is broadcasting a test sound that is picked up by a nearby amateur radio. The test sound has a frequency of 1 kHz and a wavelength of 33 cm. a) What is the wavelength of the transmitter’s radio wave (in metres)? b) What is the speed of the sound wave that is coming out of the radio (in m/s)?
The coldest and hottest temperatures ever recorded in Cuba are 33.1 degrees Fahrenheight (312 K), respectively, What is the speed of sound in air (in m/s) at each temperature? (a) speed of sound at 33.1 degrees Fahrenheight (m/s) (b) speed of sound at 101.8 degrees Fahrenheight (m/s)
A sound wave travels through a column of helium at STP. Assuming a density of p = 0.180 kg/m and a bulk modulus of B = 1.69 x 10° Pa, what is the approximate speed (in m/s) of the sound wave? m/s
11. An ultrasonic flow meter for measuring flow rate in a square channel uses two transducers that are placed at x = 0.5 m (Transducer 1) and x = 1.7 m (Transducer 2). x is measured along the length of the channel. The width of the channel is 0.2 m. The speed of sound through this medium is 1500 m/s and the flow rate is 0.4 m3/s Find the transit time (in us) of the wave from Transducer 1 to 2 and from Transducer 2 to 1 (in us)
What is the wavelength of a 256-hertz sound wave in air at 31 degrees Celsius? a b с Od 0.773 m 8.53 * 10^-7 m 1.17*10^6 m 1.37 m
The formula for measuring sound intensity in decibels is defined by the equation D = 10 log(I/I0), where I is the intensity of the sound in watts per square meter and I0 = 10-12 is the lowest level of sound that the average person can hear. How many decibels are emitted from a jet plane with a sound intensity of 8.3 x 102 watts per square meter?
30. A man drops a rock into a well and he hears the splash 3.00 seconds later. If the air temperature is 27°C, how far below the top of the well is the surface of the water? Assume that the speed of sound is constant, and you may ignore the effects of air resistance.

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