Please answer #4, thank you!!! WAVES; DOPPLER EFFECT1. A train engineer blows a whirde of 400-Hz frnguencyas the train approaches a station. If nbe speed of thetrain is 25 mis, what will be the frequency of thesound of the whistle heard by an observer in thesaion? Assume the speed of sound is 340 m/s.4. A source of sound and an observer are movingdirectly toward each other. The source has afrequency of 500 Hz and a speed of 30 m/s. Thespeed of the oBserver is 20 m/s. If the speed ofsound is 330 m/s, what is the frequency of thesound heard by the observer?2. A source of sound having a frequency of 300 Hzis moving at 25 m/s. If the speed of sound in airiş 340 m/s, what is the.frequency of the soundheard by (a)J someone in front of the movingsource; (5) someone behind the moving source?5.Compare the shift in frequency if a 2000-Hz sourceis moving toward you at 15 m/s, versus you moving towardit at 15 m/s. Are the two frequencies exactly the same?Are they close?3.A Sounding body vibrating at 400 Hz is movingaway from someone who hears a pitch corre-sponding to 380 Hz. If the speed of sound in airis 330 m/s, what is the speed of the soundingody?6.A train moving at 20 m/s sounds a hom of frequency200 Hz. Assuming that thc speed of sound is 340'm/s, what is the frequency of the sound beard by (e)a person toward whom thc train is moving, and (6)somcone from whom the train is moving away?Copy text from image

Given information: The frequency of the source (fs) = 500 Hz The speed of the source (Vs) = 30 m/s…

4. A source of sound and an observer-are moving directly toward each other. The source has a frequency of 500 Hz and a speed of 30 m/s. The speed of the observer is 20O m/s. If the speed of sound is 330 m/s, what is the frequency of the sound heard by the observer?

4. A source of sound and an observer-are moving directly toward each other. The source has a frequency of 500 Hz and a speed of 30 m/s. The speed of the observer is 20O m/s. If the speed of sound is 330 m/s, what is the frequency of the sound heard by the observer?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter17: Sound

Section: Chapter Questions

Problem 87P: Students in a physics lab are asked to find the length of an air column in a tube closed at one end...

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Concept explainers

Stretched string

A stretched string is a wire which is made up of any metal that must have a larger length compared to its thickness. The ends of the wire are fixed, and when they oscillate or are plucked, it produces two reflected transverse waves of the same frequency and same amplitude. The waves or pulses are traveling in alternate directions and superimpose with one another. This waveform is named standing or stationary waves.

Question

Please answer #4, thank you!!!

WAVES; DOPPLER EFFECT
1. A train engineer blows a whirde of 400-Hz frnguency
as the train approaches a station. If nbe speed of the
train is 25 mis, what will be the frequency of the
sound of the whistle heard by an observer in the
saion? Assume the speed of sound is 340 m/s.
4. A source of sound and an observer are moving
directly toward each other. The source has a
frequency of 500 Hz and a speed of 30 m/s. The
speed of the oBserver is 20 m/s. If the speed of
sound is 330 m/s, what is the frequency of the
sound heard by the observer?
2. A source of sound having a frequency of 300 Hz
is moving at 25 m/s. If the speed of sound in air
iş 340 m/s, what is the.frequency of the sound
heard by (a)J someone in front of the moving
source; (5) someone behind the moving source?
5.
Compare the shift in frequency if a 2000-Hz source
is moving toward you at 15 m/s, versus you moving toward
it at 15 m/s. Are the two frequencies exactly the same?
Are they close?
3.
A Sounding body vibrating at 400 Hz is moving
away from someone who hears a pitch corre-
sponding to 380 Hz. If the speed of sound in air
is 330 m/s, what is the speed of the sounding
ody?
6.
A train moving at 20 m/s sounds a hom of frequency
200 Hz. Assuming that thc speed of sound is 340
'm/s, what is the frequency of the sound beard by (e)
a person toward whom thc train is moving, and (6)
somcone from whom the train is moving away?
Copy text from image

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