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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?

Yes, exactly! Thank you.

kjhsscioly 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

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 it

Phenylethylamine wrote:

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?

Yes, exactly! Thank you.

kjhsscioly 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

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 it

oh yeah they can but its gonna be like harder or the same difficulty........im not sure

Thank you so much!

What formulas do we need to know besides wavespeed equals wavelength times frequency?

You'll definitely have to know Snell's Law. I dunno about others.

Phenylethylamine wrote:

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?

Yes, exactly! Thank you.

Difference between the two? like you subtract them? Oh, it makes sense in that sense

yeah I get it now

Hey does anyone (from pa probably) remember anything about what the pa state crave the wave test was like? thanks

On some practice tests and the like, a question will be like, "The frequency of a wave is 2 Hz, what is its wavelength?" You need speed as well to determine wavelength, so they wouldn't ask this at States without specifying if it was an EM wave or the speed, right?

wow, i just realized how awesomely useful the test exchange wiki is for all my study events, esp. DP and crave