Yes, exactly! Thank you.kjhsscioly wrote:so then the apparent frequency is greater when the vehicle is approaching you, it is just that the difference between the actual and apparent frequencies is getting less?
On last year's national event, the question was "How does the apparent frequency of a siren noise change as the ambulance passes a stationary observer?" (actually, that's paraphrased, but it's got all the important parts). The answer on the key was "As the ambulance approaches the observer, the apparent frequency increases, and as it moves away from the observer, the apparent frequency decreases." That's where I got this whole issue from. Clearly, it's possible for them to ask itkjhsscioly wrote: on a test question, they would usually ask what the Doppler effect is, not how it changes, so that is unlikely to be a question anyway
