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en.wikipedia.org/wiki/Doppler_effect

The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave (or other periodic event) for an observer moving relative to its source ...

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

The Doppler effect is observed whenever the source of waves is moving with respect to an observer. The Doppler effect can be described as the effect produced ...

.ask.com/youtube?q=Doppler+Effect&v=h4OnBYrbCjY
Jun 6, 2013 ... A visual explanation of the Doppler effect. Subscribe: http://bit.ly/1NtFJuf Facebook: ...

hyperphysics.phy-astr.gsu.edu/hbase/Sound/dopp.html

Doppler Effect. You hear the high pitch of the siren of the approaching ambulance, and notice that its pitch drops suddenly as the ambulance passes you. That is ...

www.qrg.northwestern.edu/projects/vss/docs/communications/3-what-is-the-doppler-effect.html

The Doppler effect causes the received frequency of a source (how it is perceived when it gets to its destination) to differ from the sent frequency if there is motion ...

www.grc.nasa.gov/www/k-12/airplane/doppler.html

Computer Drawing of the doppler effect with the equations which describe the change in frequency. As any object moves through the air, the air near the object  ...

www.einstein-online.info/spotlights/doppler

The frequency of a wave-like signal - such as sound or light - depends on the movement of the sender and of the receiver. This is known as the Doppler effect.

www.khanacademy.org/science/physics/mechanical-waves-and-sound/doppler-effect/v/introduction-to-the-doppler-effect

Learn about the Doppler Effect and how it explains the change in frequency of a wave when its source and an observer are moving.

www.phys.uconn.edu/~gibson/Notes/Section6_3/Sec6_3.htm

6.3 The Doppler Effect. So far, we have only considered stationary sources of sound and stationary listeners (or observers). However, if either the source or the  ...

www.bbc.co.uk/schools/gcsebitesize/science/aqa/origins/redshiftrev2.shtml

The Doppler effect. You may have noticed that when an ambulance or police car goes past, its siren is high-pitched as it comes towards you, then becomes ...