Problem Six. Two trains on separate tracks move away from each other. Train A has a speed of 156 km/h; train B, a speed of 72.0 km/h. Train B blows its horn, emitting a frequency of 400 Hz. 16.) Find the frequency (in Hz) heard by the engineer on Train A. (A) 536 (B) 476 (C) 543 (D) 226 (E) 330 17.) If the train lowers the volume of its horn by 6.0 decibels, by what has the intensity decreased by? (A) 0.25 (B) 0.33 (C) 0.51 (D) 0.62 (E) 0.76 18.) If an observer hears the train horn and then moves to a location where it's one fourth as loud, by what factor did the observer's distance from the train change by? (A) √2 (B) 2 (C) 4 (D) √2 (E) 6 19.) If the temperature of the air is doubled, find what factor the speed of the sound in air changes by. (A) 4 (B) 1/4 (C) 2 (D) √√2 (E)

Problem Six. Two trains on separate tracks move away from each other. Train A has a speed of 156 km/h; train B, a speed of 72.0 km/h. Train B blows its horn, emitting a frequency of 400 Hz. 16.) Find the frequency (in Hz) heard by the engineer on Train A. (A) 536 (B) 476 (C) 543 (D) 226 (E) 330 17.) If the train lowers the volume of its horn by 6.0 decibels, by what has the intensity decreased by? (A) 0.25 (B) 0.33 (C) 0.51 (D) 0.62 (E) 0.76 18.) If an observer hears the train horn and then moves to a location where it's one fourth as loud, by what factor did the observer's distance from the train change by? (A) √2 (B) 2 (C) 4 (D) √2 (E) 6 19.) If the temperature of the air is doubled, find what factor the speed of the sound in air changes by. (A) 4 (B) 1/4 (C) 2 (D) √√2 (E)

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter18: Superposition And Standing Waves

Section: Chapter Questions

Problem 18.7OQ: A tuning fork is known to vibrate with frequency 262 Hz. When it is sounded along with a mandolin...

See similar textbooks

Similar questions

A yellow submarine traveling horizontally at 11.0 m/s uses sonar with a frequency of 5.27 103 Hz. A red submarine is in front of the yellow submarine and moving 3.00 m/s relative to the water in the same direction. A crewman in the red submarine observes sound waves (pings) from the yellow submarine. Take the speed of sound in seawater as 1 533 m/s. (a) Write Equation 14.12. (b) Which submarine is the source of the sound? (c) Which submarine carries the observer? (d) Does the motion of the observers submarine increase or decrease the time between the pressure maxima of the incoming sound waves? How does that affect the observed period? The observed frequency? (e) Should the sign of v0 be positive or negative? (f) Does the motion of the source submarine increase or decrease the time observed between the pressure maxima? How does this motion affect the observed period? The observed frequency? (g) What sign should be chosen for vs? (h) Substitute the appropriate numbers and obtain the frequency observed by the crewman on the red submarine.
(a) At an air show a jet flies directly toward the stands at a speed of 1200 km/h, emitting a frequency of 3500 Hz, on a day when the speed of sound is 342 m/s. What frequency is received by the observers? (b) What frequency do they receive as the plane flies directly away from them?
A dolphin (Fig. P17.7) in seawater at a temperature of 25C emits a sound wave directed toward the ocean floor 150 m below. How much time passes before it hears an echo?
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?
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?
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
Two trains on separate tracks move toward each other. Train 1 has a speed of 1.30 102 km/h; train 2, a speed of 90.0 km/h. Train 2 blows its horn, emitting a frequency of 5.00 102 Hz. What is the frequency heard by the engineer on train 1?
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.
The equation of a harmonic wave propagating along a stretched string is represented by y(x, t) = 4.0 sin (1.5x 45t), where x and y are in meters and the time t is in seconds. a. In what direction is the wave propagating? be. N What are the b. amplitude, c. wavelength, d. frequency, and e. propagation speed of the wave?
A sound wave can be characterized as (a) a transverse wave, (b) a longitudinal wave, (c) a transverse wave or a longitudinal wave, depending on the nature of its source, (d) one that carries no energy, or (e) a wave that does not require a medium to be transmitted from one place to the other.
Rank the waves represented by the following functions from the largest to the smallest according to (i) their amplitudes, (ii) their wavelengths, (iii) their frequencies, (iv) their periods, and (v) their speeds. If the values of a quantity are equal for two waves, show them as having equal rank. For all functions, x and y are in meters and t is in seconds. (a) y = 4 sin (3x 15t) (b) y = 6 cos (3x + 15t 2) (c) y = 8 sin (2x + 15t) (d) y = 8 cos (4x + 20t) (e) y = 7 sin (6x + 24t)
Student A runs after Student B. Student A carries a tuning fork ringing at 1024 Hz, and student B carries a tuning fork ringing at 1000 Hz. Student A is running at a speed of vA=5.00 m/s and Student B is running at vB=6.00 m/s. What is the beat frequency heard by each student? The speed of sound is v=343.00 m/s.