AS101 Lecture 15: Doppler Effect
Document Summary
Moving towards an observer, they are compressed; moving away from observer, they are stretched. The doppler effect is the apparent change in wavelength of sound as an object moved towards and then away from an observer. Characteristic change in frequency of a wave for an observer moving relative to the source of the wave. This change occurs because as an object moves towards an observer the waves get compressed causing a higher pitch and as an object moves away from an observer the waves get stretched causing a lower pitch. This change in pitch can be calculated with the following formula: There are a number of applications that use the doppler effect. Doppler radar the speed of an object (ex a speeding car or a baseball) is measured by firing a radar beam towards the moving object, measures the speed of an object like a car or baseball.
