(a) A symphony is being broadcast live over the radio. There is a microphone at the center of the stage that picks up the sounds of the orchestra. A driver 100 km away is listening to the broadcast on a car radio. So is a symphony patron in the front row, 10 m from center stage. Compute how long it takes for the sound to reach each listener. Who hears the first note first?

(a) A symphony is being broadcast live over the radio. There is a microphone at the center of the stage that picks up the sounds of the orchestra. A driver 100 km away is listening to the broadcast on a car radio. So is a symphony patron in the front row, 10 m from center stage. Compute how long it takes for the sound to reach each listener. Who hears the first note first?

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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Concept explainers

Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.

Question

3 Time Delay
(a) A symphony is being broadcast live over the radio. There is a microphone at the center of the stage that picks up
the sounds of the orchestra. A driver 100 km away is listening to the broadcast on a car radio. So is a symphony
patron in the front row, 10m from center stage.
Compute how long it takes for the sound to reach each listener. Who hears the first note first?
(b) Two light pulses are emitted simultaneously from a single source. Both pulses travel to the same detector, but one
pulse travels in air the entire distance while the other travels through 2.0 m of ice (n = 1.309) along the way. What
is the difference in the arrival time of the two pulses?

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For testing purposes, a musical instrument manufacturing company creates a device so that when you blow into one end with your instrument, sound comes out the other end in opposite directions. A sound technician uses a whistle and generates sound waves with a frequency of 200 Hz. The waves travel in opposite directions in a sound studio, are reflected by end walls, and return. The studio is 50.0 m long and the whistle is located 14.0 m from one end. What is the phase difference (in degrees) between the reflected waves when they meet at the source of the sound? The speed of sound in air is 343 m/s.
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A 1,720-Hz tone is played on a stereo in an open field. A person stands at a point that is 4 m from one of the speakers and 4.4 m from the other. What must the minimum wavelength be for the person to hear the tone? (Hint: because of interference, two waves add constructively or destructively. If the sound is heard the interference must be constructive. For interference to be constructive, the difference in distance must be a multiple of the wavelength. That is, the difference in distances from the speakers must be 1 wavelength, two wavelengths, three wavelengths, etc.)