![]() Imagine a police car with a siren emitting a frequency of 700\text. Let’s start by exploring a classic example of the Doppler effect where the source of the sound is moving. Let’s apply these strategies! Moving Source If they’re moving apart, it should be lower. In this case, the maxima of the amplitude of the wave produced occur at intervals of the period T 1. Let’s say we have a source emitting sound with the frequency. ambulance siren) are both stationary, the waves are at the same frequency for both the observer and the source. For example, if the source and observer are moving toward each other, the observed frequency should be higher than the original. The Doppler eect 1 Moving sources We’d like to understand what happens when waves are produced from a moving source. A frequency change due to the relative motion between a source of sound or light and an observer is known as the doppler effect (or doppler shift) When the observer (e.g. Check Yourself: After solving the problem, see if your answer makes sense.You can see from the equation above that when the observer is not moving, vo 0, we recover Equation 8.4.6 for the stationary observer and a moving source. ![]()
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