You shout “hello” into an echo chamber that is 250 m long. Assuming that the speed of sound is 340 m/s , how long will it take for you to hear your echo? We are going to pretend that there is no damping of the sound and this echo chamber is perfectly reflective in only 1- dimension ( Horizontally). Hint: how far does the wave travel before it reaches you?

You shout “hello” into an echo chamber that is 250 m long. Assuming that the speed of sound is 340 m/s , how long will it take for you to hear your echo? We are going to pretend that there is no damping of the sound and this echo chamber is perfectly reflective in only 1- dimension ( Horizontally). Hint: how far does the wave travel before it reaches you?

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter16: Electromagnetic Waves

Section: Chapter Questions

Problem 92AP: Show that the wave equation in one dimension 2fx2=1v22ft2 Is satisfied by any doubly differentiable...

See similar textbooks

Similar questions

Show that the wave equation in one dimension 2fx2=1v22ft2 Is satisfied by any doubly differentiable function of either the form f(x — vt) or f(x + vt).
the reflection of sound is often heard as an echo. if a person claps her hands and hears an echo off a wall 0.25s later, how far away is the wall? the speed of sound is 300ms^-1.
A speaker has a diameter of 0.30 m. (a) Assuming that the speed of sound is 343 m/s, find the diffraction angle u for a 2.0-kHz tone. (b) What speaker diameter D should be used to generate a 6.0-kHz tone whose diffraction angle is as wide as that for the 2.0-kHz tone in part (a)?
You should hello into an echo chamber that is 250 m long. Assuming that the speed of sound is 340 m/s, how long will it take for you to hear your echo? Pretend that there is no damping of the sound and this echo chamber is perfectly reflective in only 1 dimension horizontally.
(a) Neil A. Armstrong was the first person to walk on the moon. The distance between the earth and the moon is 3.85 × 108 m. Find the time it took for his voice to reach the earth via radio waves. (b) Someday a person will walk on Mars, which is 5.60 × 1010 m from the earth at the point of closest approach. Determine the minimum time that will be required for a message from Mars to reach the earth via radio waves.
(a) Neil A. Armstrong was the first person to walk on the moon. The distance between the earth and the moon is 3.85 x 108 m. Find the time it took for his voice to reach the earth via radio waves. (b) Someday a person will walk on Mars, which is 5.60 × 1010 m from the earth at the point of closest approach. Determine the minimum time that will be required for a message from Mars to reach the earth via radio waves. (a) Number i (b) Numberi Units Units
A music song recorded in a studio is stored as a digital sequence on a CD. The analog signal representing the music is 2 minutes long and is sampled at a frequency fs=44100s-1 . How many samples should be stored on the CD? Write the number of samples without commas or dots. Assume that the audio file is mono, or in other words, single channel.
Jo and Em are both standing different distances from a speaker that is outputting 4. sound uniformly in all directions. Jo is hearing a sound intensity level of 35.0dB. Em is hearing a sound intensity level of 62.0dB. a. What are the intensities heard by Jo and Em? [Recall that there is a difference in meaning between "sound intensity level" and "intensity".] b. If Jo is 150m from the speaker, how far is Em from the speaker? c. If Em's eardrum is 1.20x10 m? , how much sound energy hits Em's eardrum in 20.0s ?
AM radio signals are broadcast at frequencies between 550 kHz (kilohertz) and 1600 kHz and travel at 3 x 10^8 m/s. a) What is the range of wavelengths for those signals? b) FM frequencies range between 88 MHz (megahertz) and 108 MHz and travel at the the same speed. What is the range of the FM frequencies.
A physicist at a fireworks display times the lag between seeing an explosion and hearing its sound, and finds it to be 0.371 s. How far away in meters is the explosion if air temperature is 24.0°C and if you neglect the time taken for light to reach the physicist? Assume the speed of sound in 0°C air is 331 m/s. Type your answer.....
Write your understanding about coherent waves. A steel wire in a piano has a length of L = 0.9m and a mass of m = 5.4 g. To what tension T must this wire be stretched so that its fundamental а. vibration possess a frequency f= 261.6 Hz? b. The equation of a plane sound wave is, y(x, t) = 6.0 × 10-6 sin(5.7x – 1500t). Find the frequency, the wavelength and the velocity of the wave. Compare the wavelength with the amplitude of the oscillations and the wave velocity with the amplitude of the velocity of the oscillations. What is the phase shift between the oscillations of two points 30.0 cm apart in the direction of the sound wave?
Question 4 (a) Write your understanding about coherent waves. (b) A loudspeaker hanging on a long rod radiates sound waves uniformly in all directions. At a distance of 15.0 m from the speaker, the sound intensity is 0.25 W/m². At what distance is the intensity 0.1 W/m²? Question 5 (a) A 1.4-kg 15-cm-diameter solid sphere is rotating about its diameter at 70 rev/min. What is its kinetic energy? (b) Explain why you expect an object made of a stiff material to vibrate at a higher frequency than a similar object made of a more flexible material.