The Electromagnetic Spectrum and the Doppler Effect

Although astronomers use the Doppler effect on light to measure the movement of stars, the Doppler effect is actually a general wave phenomenon, meaning it applies to sound waves as well. Take a few moments (around 10 seconds) to listen to any sounds that are taking place around you. You may be in a classroom, at home, or even out on the street. If you have a mobile device, smartphone, or any other digital recording device, you may want to record around 10 seconds of sound.

If you are unable to listen to any external sounds at the moment, you can also view the short video Lincoln Memorial from eMediaVA℠. This clip was filmed outside of the Lincoln Memorial in the city of Washington D.C.

Are you able to identify all of the sounds and their locations? Why do you think you cannot always pinpoint the direction of the source when it is further away? How does sound change over time?