logging in or signing up DOPPLER EFFECT louise.woolford Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 3813 Category: Entertainment License: All Rights Reserved Like it (6) Dislike it (0) Added: July 14, 2009 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... By: abualshabab99 (4 month(s) ago) Very nice presentation. Can I download it please? Saving..... Post Reply Close Saving..... Edit Comment Close By: PORFER (10 month(s) ago) nice presentation to be used in a physic class Saving..... Post Reply Close Saving..... Edit Comment Close By: josjohn (11 month(s) ago) nice presentation ,can i download it? Saving..... Post Reply Close Saving..... Edit Comment Close By: jonquille (12 month(s) ago) nice presentation Saving..... Post Reply Close Saving..... Edit Comment Close By: dynamic72 (13 month(s) ago) this is very good,!hope i can download this presentation Saving..... Post Reply Close Saving..... Edit Comment Close loading.... See all Premium member Presentation Transcript Slide 1: JP © Slide 2: JP © Slide 3: JP © Slide 4: JP © THE DOPPLER EFFECT Slide 5: JP © This is the apparent change in the frequency of a wave motion as noted by an observer when there is relative motion between the source and the observer . THE DOPPLER EFFECT Slide 6: JP © The Effect is caused by the Motion of the source, the observer, or both source and the observer. MOVING SOURCE This causes the wave crests to bunch up in front of the source & the wave crests to be more widely spaced behind the source. The overall effect is to cause a change in wavelength. The wave speed is not affected by the motion of the source. Slide 7: JP © OBSERVER MOVING THIS CAUSES A CHANGE IN THE APPARENT WAVE SPEED. There is no change in wavelength. If the observer is moving towards the source, the speed of the wavefronts relative to him will be increased and he will receive more waves per second. Moving away from the source the speed of the waves relative to him will be decreased and less waves will pass him per second . Slide 8: JP © SOURCE STATIONARY ? CONSTANT, f CONSTANT Slide 9: JP © SOURCE MOVING TOWARDS OBSERVER ? - REDUCED, f - INCREASED Slide 10: JP © SOURCE MOVING AWAY FROM OBSERVER ? - INCREASED, f - DECREASED Slide 11: JP © OBSERVER MOVING TOWARDS SOURCE MEETS MORE WAVES PER SECOND The Effective Velocity of the waves is increased Slide 12: JP © OBSERVER MOVING AWAY FROM SOURCE RECEIVES LESS WAVES PER SECOND The Effective Velocity of the waves is reduced Slide 13: JP © SOURCE AND OBSERVER MOVING BOTH WAVELENGTH AND EFFECTIVE WAVE VELOCITY ARE CHANGED Slide 14: JP © Red shift The colour of light is related to its frequency / wavelength DOPPLER SHIFT IN LIGHT RELATIVE MOTION BETWEEN SOURCE AND OBSERVER CHANGES THE COLOUR OBSERVED. The emission and absorption lines of the light from distant stars and galaxies show a shift towards the red end of the spectrum as compared with those of the same elements in a laboratory source. Slide 15: JP © This effect is called red shift . It is interpreted as due to recessional motion of the stars / galaxies from our solar system . This suggests that the Universe is ?? EXPANDING Note that it is possible for some close by stars and galaxies to show a Blue Shift Slide 16: JP © Source moving away Red shifted light >>>> Source moving towards Blue shifted light >>>> Slide 17: JP © Consider a source emitting light with wavelength ?. The time for one wave to be emitted is the reciprocal of the frequency, i.e. 1/f. Remember that c = f ? , so . If the source is moving away at a speed v, it will have moved away from the observer a distance of ? metres during the time it takes for one wave to be emitted. {distance = velocity x time} Slide 18: JP © Hence the change in the wavelength of the light is given by: The fractional change in the wavelength is . This applies as long as v << c . Slide 19: JP © The fractional change in frequency is given by a similar formula Identical changes in wavelength and frequency occur if the source is approaching. Slide 20: JP © Continuous Spectrum Hydrogen Absorption Spectrum as viewed in Earth Laboratory Hydrogen Absorption Spectrum viewed from a Receding Star ?? Slide 21: JP © APPLICATIONS 1. Speed of rotation of the Sun 2. Speed of rotation of the Planets 3. Speed of rotation of Saturn’s Rings 4. Speed of rotation of galaxies 5. Speed of recession of galaxies Slide 22: JP © What does our friend hear? VELOCITY OF SOURCE = WAVE VELOCITY VELOCITY OF SOURCE > WAVE VELOCITY You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
DOPPLER EFFECT louise.woolford Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 3813 Category: Entertainment License: All Rights Reserved Like it (6) Dislike it (0) Added: July 14, 2009 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... By: abualshabab99 (4 month(s) ago) Very nice presentation. Can I download it please? Saving..... Post Reply Close Saving..... Edit Comment Close By: PORFER (10 month(s) ago) nice presentation to be used in a physic class Saving..... Post Reply Close Saving..... Edit Comment Close By: josjohn (11 month(s) ago) nice presentation ,can i download it? Saving..... Post Reply Close Saving..... Edit Comment Close By: jonquille (12 month(s) ago) nice presentation Saving..... Post Reply Close Saving..... Edit Comment Close By: dynamic72 (13 month(s) ago) this is very good,!hope i can download this presentation Saving..... Post Reply Close Saving..... Edit Comment Close loading.... See all Premium member Presentation Transcript Slide 1: JP © Slide 2: JP © Slide 3: JP © Slide 4: JP © THE DOPPLER EFFECT Slide 5: JP © This is the apparent change in the frequency of a wave motion as noted by an observer when there is relative motion between the source and the observer . THE DOPPLER EFFECT Slide 6: JP © The Effect is caused by the Motion of the source, the observer, or both source and the observer. MOVING SOURCE This causes the wave crests to bunch up in front of the source & the wave crests to be more widely spaced behind the source. The overall effect is to cause a change in wavelength. The wave speed is not affected by the motion of the source. Slide 7: JP © OBSERVER MOVING THIS CAUSES A CHANGE IN THE APPARENT WAVE SPEED. There is no change in wavelength. If the observer is moving towards the source, the speed of the wavefronts relative to him will be increased and he will receive more waves per second. Moving away from the source the speed of the waves relative to him will be decreased and less waves will pass him per second . Slide 8: JP © SOURCE STATIONARY ? CONSTANT, f CONSTANT Slide 9: JP © SOURCE MOVING TOWARDS OBSERVER ? - REDUCED, f - INCREASED Slide 10: JP © SOURCE MOVING AWAY FROM OBSERVER ? - INCREASED, f - DECREASED Slide 11: JP © OBSERVER MOVING TOWARDS SOURCE MEETS MORE WAVES PER SECOND The Effective Velocity of the waves is increased Slide 12: JP © OBSERVER MOVING AWAY FROM SOURCE RECEIVES LESS WAVES PER SECOND The Effective Velocity of the waves is reduced Slide 13: JP © SOURCE AND OBSERVER MOVING BOTH WAVELENGTH AND EFFECTIVE WAVE VELOCITY ARE CHANGED Slide 14: JP © Red shift The colour of light is related to its frequency / wavelength DOPPLER SHIFT IN LIGHT RELATIVE MOTION BETWEEN SOURCE AND OBSERVER CHANGES THE COLOUR OBSERVED. The emission and absorption lines of the light from distant stars and galaxies show a shift towards the red end of the spectrum as compared with those of the same elements in a laboratory source. Slide 15: JP © This effect is called red shift . It is interpreted as due to recessional motion of the stars / galaxies from our solar system . This suggests that the Universe is ?? EXPANDING Note that it is possible for some close by stars and galaxies to show a Blue Shift Slide 16: JP © Source moving away Red shifted light >>>> Source moving towards Blue shifted light >>>> Slide 17: JP © Consider a source emitting light with wavelength ?. The time for one wave to be emitted is the reciprocal of the frequency, i.e. 1/f. Remember that c = f ? , so . If the source is moving away at a speed v, it will have moved away from the observer a distance of ? metres during the time it takes for one wave to be emitted. {distance = velocity x time} Slide 18: JP © Hence the change in the wavelength of the light is given by: The fractional change in the wavelength is . This applies as long as v << c . Slide 19: JP © The fractional change in frequency is given by a similar formula Identical changes in wavelength and frequency occur if the source is approaching. Slide 20: JP © Continuous Spectrum Hydrogen Absorption Spectrum as viewed in Earth Laboratory Hydrogen Absorption Spectrum viewed from a Receding Star ?? Slide 21: JP © APPLICATIONS 1. Speed of rotation of the Sun 2. Speed of rotation of the Planets 3. Speed of rotation of Saturn’s Rings 4. Speed of rotation of galaxies 5. Speed of recession of galaxies Slide 22: JP © What does our friend hear? VELOCITY OF SOURCE = WAVE VELOCITY VELOCITY OF SOURCE > WAVE VELOCITY