# NTNUJAVA Virtual Physics LaboratoryEnjoy the fun of physics with simulations! Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/

## Easy Java Simulations (2001- ) => wave and fluid => Topic started by: ahmedelshfie on April 23, 2010, 06:27:35 pm

 Title: Doppler Effect Post by: ahmedelshfie on April 23, 2010, 06:27:35 pm This applet created by Prof HwangModified by AhmedOriginal project  Doppler Effect (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=851.msg5981#new)Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. Title: Re: Doppler Effect Post by: ahmedelshfie on April 23, 2010, 07:59:53 pm The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842, is the change in frequency of a wave for an observer moving relative to the source of the wave. It is commonly heard when a vehicle sounding a siren or horn approaches, passes, and recedes from an observer. The received frequency is higher (compared to the emitted frequency) during the approach, it is identical at the instant of passing by, and it is lower during the recession.For waves that propagate in a medium, such as sound waves, the velocity of the observer and of the source are relative to the medium in which the waves are transmitted. The total Doppler effect may therefore result from motion of the source, motion of the observer, or motion of the medium. Each of these effects is analyzed separately. For waves which do not require a medium, such as light or gravity in general relativity, only the relative difference in velocity between the observer and the source needs to be considered. From   http://en.wikipedia.org/wiki/Doppler_effect Title: Re: Doppler Effect Post by: ahmedelshfie on April 23, 2010, 08:03:10 pm Images from  http://en.wikipedia.org/wiki/Doppler_effect Title: Re: Doppler Effect Post by: ahmedelshfie on April 27, 2010, 05:48:45 pm Video youtube about doppler effect   http://www.youtube.com/watch?v=-t63xYSgmKE :) Title: Re: Doppler Effect Post by: ahmedelshfie on October 06, 2010, 02:19:54 am This applet design by prof Hwang using JDK1.0.2Original URL Moving Point source: Doppler effect and shock wave (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=21.msg7146#new)