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25. Two sound sources each produce sound of frequency 500Hz. One is at the origin and the other is moving at a constant speed of 10 along the x-axis. The speed of sound in air is 340″. An observer at the origin hears beats between the two sounds. When the moving sound source is moving away from the observer, what best describes the beat frequency, as compared to when it is moving towards the observer? (a) fbeat 15.2Hz and the beat frequency is higher than when the source was moving towards the observer. = (b) fbeat 15.2Hz and the beat frequency is lower than when the source was moving towards the observer. - (c) fbeat = 14.7Hz and the beat frequency is the same than when the source was moving towards the observer. (d) fbeat 14.3Hz and the beat frequency is higher than when the source was moving towards the observer. - (e) fbeat = 14.3Hz and the beat frequency is lower than when the source was moving towards the observer.

25. Two sound sources each produce sound of frequency 500Hz. One is at the origin and the other is moving at a constant speed of 10 along the x-axis. The speed of sound in air is 340″. An observer at the origin hears beats between the two sounds. When the moving sound source is moving away from the observer, what best describes the beat frequency, as compared to when it is moving towards the observer? (a) fbeat 15.2Hz and the beat frequency is higher than when the source was moving towards the observer. = (b) fbeat 15.2Hz and the beat frequency is lower than when the source was moving towards the observer. - (c) fbeat = 14.7Hz and the beat frequency is the same than when the source was moving towards the observer. (d) fbeat 14.3Hz and the beat frequency is higher than when the source was moving towards the observer. - (e) fbeat = 14.3Hz and the beat frequency is lower than when the source was moving towards the observer.

University Physics Volume 1
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 55P: During a 4th of July celebration, an M80 firework explodes on the ground, producing a bright flash...
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The answer is E but im not sure why 

25. Two sound sources each produce sound of frequency 500Hz. One is at the origin and the other is moving at a constant speed of 10m along the x-axis. The speed of sound in air is 340″. An observer at the origin hears beats between the two sounds. When the moving sound source is moving away from the observer, what best describes the beat frequency, as compared to when it is moving towards the observer? (a) fbeat 15.2Hz and the beat frequency is higher than when the source was moving towards the observer. = (b) fbeat 15.2Hz and the beat frequency is lower than when the source was moving towards the observer. = (c) fbeat 14.7Hz and the beat frequency is the same than when the source was moving towards the observer. = (d) fbeat 14.3Hz and the beat frequency is higher than when the source was moving towards the observer. = (e) fbeat = 14.3Hz and the beat frequency is lower than when the source was moving towards the observer.
Transcribed Image Text:25. Two sound sources each produce sound of frequency 500Hz. One is at the origin and the other is moving at a constant speed of 10m along the x-axis. The speed of sound in air is 340″. An observer at the origin hears beats between the two sounds. When the moving sound source is moving away from the observer, what best describes the beat frequency, as compared to when it is moving towards the observer? (a) fbeat 15.2Hz and the beat frequency is higher than when the source was moving towards the observer. = (b) fbeat 15.2Hz and the beat frequency is lower than when the source was moving towards the observer. = (c) fbeat 14.7Hz and the beat frequency is the same than when the source was moving towards the observer. = (d) fbeat 14.3Hz and the beat frequency is higher than when the source was moving towards the observer. = (e) fbeat = 14.3Hz and the beat frequency is lower than when the source was moving towards the observer.
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