Doppler Effect - Revision history

Bsang3: /* References */

2017-11-29T04:49:40Z

References

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	https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/doppler-effect/v/doppler-effect-formula-for-observed-frequency		https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/doppler-effect/v/doppler-effect-formula-for-observed-frequency

	~~http://www.school-for-champions.com/science/waves_doppler_effect_wavelength_derivations.htm#.Wh3WsEqnE2w~~

	http://www.sparknotes.com/testprep/books/sat2/physics/chapter17section6.rhtml		http://www.sparknotes.com/testprep/books/sat2/physics/chapter17section6.rhtml

2017-11-29T04:49:27Z

References

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	http://www.sparknotes.com/testprep/books/sat2/physics/chapter17section6.rhtml		http://www.sparknotes.com/testprep/books/sat2/physics/chapter17section6.rhtml

			https://www.historychannel.com.au/this-day-in-history/doppler-is-born-his-effect-soon-discovered/

	[[Category:Which Category did you place this in?]]		[[Category:Which Category did you place this in?]]

2017-11-29T04:49:10Z

History

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	==History==		==History==
			Christian Doppler formulated the principle the Doppler Effect as he is an Austrian mathematician and physicist. The principle originated in his essay from 1842 "On the coloured light of the binary stars and some other stars of the heavens". He came across the Doppler Effect as he tried to come up with an explanation of the color of binary stars.
	~~Put this idea~~ in ~~historical context~~. ~~Give~~ the ~~reader~~ the ~~Who, What, When, Where, and Why~~.

	== See also ==		== See also ==

2017-11-29T04:42:54Z

Connectedness

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	==Connectedness==		==Connectedness==
	#~~How is this topic connected to something that you are~~ interested in?		#I was always interested in sound as I am from New York and I love New York City. Having heard all of this noise from car honking, I was initially curious as to why there's such a huge change when the car moves past me when I'm walking on the sidewalk. I've later watched The Big Bang Theory and they explained as to why this occurs so I was always fascinated by this topic.
	~~#How is it connected~~ to ~~your major?~~
	~~#Is~~ there ~~an interesting industrial application?~~

	==History==		==History==

2017-11-29T04:38:50Z

Examples

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	A cop car drives at 45 m/s toward the scene of a crime, with its siren blaring at a frequency of 2500 Hz. At what frequency do people hear the siren as it approaches? At what frequency do they hear it as it passes? The speed of sound in the air is 343 m/s.		A cop car drives at 45 m/s toward the scene of a crime, with its siren blaring at a frequency of 2500 Hz. At what frequency do people hear the siren as it approaches? At what frequency do they hear it as it passes? The speed of sound in the air is 343 m/s.

	[[File:~~Solution~~.jpg]]		[[File:SolutionforBrian.jpg]]

	==Connectedness==		==Connectedness==

2017-11-29T04:38:12Z

Examples

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	A cop car drives at 45 m/s toward the scene of a crime, with its siren blaring at a frequency of 2500 Hz. At what frequency do people hear the siren as it approaches? At what frequency do they hear it as it passes? The speed of sound in the air is 343 m/s.		A cop car drives at 45 m/s toward the scene of a crime, with its siren blaring at a frequency of 2500 Hz. At what frequency do people hear the siren as it approaches? At what frequency do they hear it as it passes? The speed of sound in the air is 343 m/s.

			[[File:Solution.jpg]]

	==Connectedness==		==Connectedness==

2017-11-29T04:22:58Z

More Specific Formulas

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	::<math>v_\text{r} \,</math> is the velocity of the receiver relative to the medium; positive if the receiver is moving towards the source (and negative in the other direction);		::<math>v_\text{r} \,</math> is the velocity of the receiver relative to the medium; positive if the receiver is moving towards the source (and negative in the other direction);
	::<math>v_\text{s} \,</math> is the velocity of the source relative to the medium; positive if the source is moving away from the receiver (and negative in the other direction).		::<math>v_\text{s} \,</math> is the velocity of the source relative to the medium; positive if the source is moving away from the receiver (and negative in the other direction).

	~~==More Specific Formulas==~~

	~~Before the source moves past the observer formula~~
	~~::<math>f = \left( \frac{v}{v - v_\text{s}} \right) f \,</math>~~

	~~After the source moves past the observer formula~~
	~~::<math>f = \left( \frac{v}{v + v_\text{s}} \right) f \,</math>~~

	==Examples==		==Examples==

2017-11-29T04:22:24Z

Examples

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	==Examples==		==Examples==

	A cop car drives at 30 m/s toward the scene of a crime, with its siren blaring at a frequency of ~~2000~~ Hz. At what frequency do people hear the siren as it approaches? At what frequency do they hear it as it passes? The speed of sound in the air is 343 m/s.		A cop car drives at 45 m/s toward the scene of a crime, with its siren blaring at a frequency of 2500 Hz. At what frequency do people hear the siren as it approaches? At what frequency do they hear it as it passes? The speed of sound in the air is 343 m/s.

	==Connectedness==		==Connectedness==

2017-11-29T04:19:47Z

References

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	http://www.physicsclassroom.com/class/waves/Lesson-3/The-Doppler-Effect		http://www.physicsclassroom.com/class/waves/Lesson-3/The-Doppler-Effect

	https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/doppler-effect/v/doppler-effect-formula-for-observed-frequency		https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/doppler-effect/v/doppler-effect-formula-for-observed-frequency

	http://www.school-for-champions.com/science/waves_doppler_effect_wavelength_derivations.htm#.Wh3WsEqnE2w		http://www.school-for-champions.com/science/waves_doppler_effect_wavelength_derivations.htm#.Wh3WsEqnE2w

	http://www.sparknotes.com/testprep/books/sat2/physics/chapter17section6.rhtml		http://www.sparknotes.com/testprep/books/sat2/physics/chapter17section6.rhtml


	[[Category:Which Category did you place this in?]]		[[Category:Which Category did you place this in?]]

2017-11-29T04:19:29Z

References

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	This section contains the the references you used while writing this page		This section contains the the references you used while writing this page

	http://www.physicsclassroom.com/class/waves/Lesson-3/The-Doppler-Effect		http://www.physicsclassroom.com/class/waves/Lesson-3/The-Doppler-Effect
	https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/doppler-effect/v/doppler-effect-formula-for-observed-frequency		https://www.khanacademy.org/science/physics/mechanical-waves-and-sound/doppler-effect/v/doppler-effect-formula-for-observed-frequency