The following graph represents the perceived frequency of a car as it passes a student. Perceived Frequency (Hz) 264 220 Time (s) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 (a) If the true frequency of the car's horn is 240 Hz, how fast was the car traveling (in m/s)? (Assume the speed of sound is 343 m/s.) m/s (b) On the graph above, draw a line demonstrating the perceived frequency for a car traveling twice as fast. Label all intercepts, maximums, and minimums on the graph. (Assume the perceived frequency for the car traveling twice as fast is in blue.) Perceived Frequency (Hz) Perceived Frequency (Hz) Perceived Frequency (Hz) Perceived Frequency (Hz) 293 293 264 264 264 251 251 230 22아 230 220 220 220 203 203 Time (s) Time (s) - Time (s) Time (s) 0.2 0.4 0.6 0,8 1.0 1.2 1.4 0.4 0.8 1.2 1.6 2.0 2.4 2.8 0.4 0.8 1.2 1.6 2.0 2.4 2.8 0.2 0.4 0.6 0.8 1.0 1.2 1.4

The following graph represents the perceived frequency of a car as it passes a student. Perceived Frequency (Hz) 264 220 Time (s) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 (a) If the true frequency of the car's horn is 240 Hz, how fast was the car traveling (in m/s)? (Assume the speed of sound is 343 m/s.) m/s (b) On the graph above, draw a line demonstrating the perceived frequency for a car traveling twice as fast. Label all intercepts, maximums, and minimums on the graph. (Assume the perceived frequency for the car traveling twice as fast is in blue.) Perceived Frequency (Hz) Perceived Frequency (Hz) Perceived Frequency (Hz) Perceived Frequency (Hz) 293 293 264 264 264 251 251 230 22아 230 220 220 220 203 203 Time (s) Time (s) - Time (s) Time (s) 0.2 0.4 0.6 0,8 1.0 1.2 1.4 0.4 0.8 1.2 1.6 2.0 2.4 2.8 0.4 0.8 1.2 1.6 2.0 2.4 2.8 0.2 0.4 0.6 0.8 1.0 1.2 1.4

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter13: Mechanical Waves

Section: Chapter Questions

Problem 15OQ: As you travel down the highway in your car, an ambulance approaches you from the rear at a high...

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A driver travels northbound on a highway at a speed of 25.0 m/s. A police car. traveling southbound at a speed of 40.0 m/s. approaches with its siren producing sound at a frequency of 2 500 Hz. (a) What frequency does the driver observe as the police car approaches? (b) What frequency does the driver detect after the police car passes him? (c) Repeat parts (a) and (b) for the case when the police car is behind the driver and travels northbound.
On a particular day the speed of sound in air is 340 m/s. If a plane flies at a speed of 680 m/s, is its Mach number (a) 1.5, (b) 2.0, (c) 2.5, or (d) 2.7?
A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 30.0 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 3.0 1011 W/m2. What is the intensity delivered to the eardrum?
A siren mounted 011 the roof of a firehouse emits sound at a frequency of 900 Hz. A steady wind is blowing with a speed of 15.0 m/s. Taking the speed of sound in calm air to be 343 m/s. find the wavelength of the sound (a) upwind of the siren and (b) downwind of the siren. Firefighters are approaching the siren from various directions at 15.0 m/s. What frequency does a firefighter hear (c) if she is approaching from an upwind position so that site is moving in the direction in which the wind is blowing and (d) if she is approaching from a downwind position and moving against the wind?
A flute has a length of 58.0 cm. If the speed of sound in air is 343 m/s, what is the fundamental frequency of the flute, assuming it is a tube closed at one end and open at the other? (a) 148 Hz (b) 296 Hz (c) 444 Hz (d) 591 Hz (e) none of those answers
The area of a typical eardrum is about 5.00 X 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. (b) How much energy is transferred to the eardrum exposed to this sound lor 1.00 mill?
A sound wave in air has a pressure amplitude equal to 4.00 103 Pa. Calculate the displacement amplitude of the wave at a frequency of 10.0 kHz.
A tuning fork is known to vibrate with frequency 262 Hz. When it is sounded along with a mandolin siring, four beats are heard every second. Next, a bit of tape is put onto each line of the tuning fork, and the tuning fork now produces five beats per second with the same mandolin siring. What is the frequency of the string? (a) 257 Hz (b) 258 Hz (c) 262 Hz (d) 266 Hz (e) 267 Hz
As you travel down the highway in your car, an ambulance approaches you from the rear at a high speed (Fig. OQ13.15) sounding its siren at a frequency of 500 Hz. Which statement is correct? (a) You hear a frequency less than 500 Hz. (b) You hear a frequency equal to 500 Hz. (c) You hear a frequency greater than 500 Hz. (d) You hear a frequency greater than 500 Hz, whereas the ambulance driver hears a frequency lower than 500 Hz. (e) You hear a frequency less than 500 Hz, whereas the ambulance driver hears a frequency of 500 Hz. Figure OQ13.15
The bulk modulus of water is 2.2 109 Pa (Table 15.2). The density of water is 103 kg/m3 (Table 15.1). Find the speed of sound in water and compare your answer with the value given in Table 17.1.
A fireworks rocket explodes at a height of 100 m above the ground. An observer on the ground directly under the explosion experiences an average sound intensity of 7.00 102 W/m2 for 0.200 s. (a) What is the total amount of energy transferred away from the explosion by sound? (b) What is the sound level (in decibels) heard by the observer?