The Law Posted December 25, 2009 Report Share Posted December 25, 2009 I find these questions are very straight forward, but I want to have a system in place to try to answer these questions. I'm a bit confused with EK's system, so I'm wondering if anyone can explain what system they have in place to answer doppler questions! These questions should be fairly easy marks... Link to comment Share on other sites More sharing options...
Octavius Posted December 26, 2009 Report Share Posted December 26, 2009 System? Never used one, just went on intuition. Never got a doppler question wrong though. You can tell whether the frequency will be higher or lower than the original based on the relative movement of the source and observer. In any case, were you referring to a formula such as this as a system? F = F0 [(V + Vo) / (V + Vs)] - it basically says the same thing but you'll know F based on intuition V = speed of waves in medium o = observer s = source EK is weird man, Berkeley Review/TPR is pretty good for physics. Link to comment Share on other sites More sharing options...
The Law Posted December 26, 2009 Author Report Share Posted December 26, 2009 EK uses: Delta lamba relative velocity (obv vs source) ----------- = ---------------------------------- lambda speed of wave The relative velocity is what confuses me sometimes. I find that method sometimes faster, but sometimes F = V + Vo / V + Vs is also good. I think EK>>>TPR for the MCAT. TPR is too much like your run of the mill science book in my op. Link to comment Share on other sites More sharing options...
Octavius Posted December 26, 2009 Report Share Posted December 26, 2009 True...EK keeps it quick and intuitive but sometimes they have really really convoluted systems where general theory would just do. Like their system of optics threw me off hahah. I think EK was definitely instrumental in my prep because it emphasized intuition and main concepts only but I think TBR took the cake with the practice passages. TPR is best if you haven't seen anything in so long. The relative velocity can just be though of as the net velocity between the two objects, so just define your directions left/right/up/down as positive and the other negative and just add it to get the relative velocity. The ratio of the relative over the speed of the wave is directly proportional to the ratio of the altered frequency over the source frequency. I just went on qualitative judgement and got lucky hahah. Ahh I miss studying for the MCAT, good times but I wish not to repeat it since time is often limited. Link to comment Share on other sites More sharing options...
The Law Posted December 28, 2009 Author Report Share Posted December 28, 2009 True...EK keeps it quick and intuitive but sometimes they have really really convoluted systems where general theory would just do. Like their system of optics threw me off hahah. I think EK was definitely instrumental in my prep because it emphasized intuition and main concepts only but I think TBR took the cake with the practice passages. TPR is best if you haven't seen anything in so long. The relative velocity can just be though of as the net velocity between the two objects, so just define your directions left/right/up/down as positive and the other negative and just add it to get the relative velocity. The ratio of the relative over the speed of the wave is directly proportional to the ratio of the altered frequency over the source frequency. I just went on qualitative judgement and got lucky hahah. Ahh I miss studying for the MCAT, good times but I wish not to repeat it since time is often limited. It's funny you should say that. Their system of optics is the ONLY reason I can answer optics probs is b/c of those rules and diagrams! haha TPR PS sections are fairly representative of the real thing though! Good practice. Link to comment Share on other sites More sharing options...
The Law Posted December 28, 2009 Author Report Share Posted December 28, 2009 Sent you a PM neuronix. Link to comment Share on other sites More sharing options...
Pantaloons Posted December 28, 2009 Report Share Posted December 28, 2009 Hey Law, can you get your hands on a TPR physics review book? I actually really like TPR's method of doing Dopplar Effect problems. It's easy, logical, and intuitive. Let me know. Link to comment Share on other sites More sharing options...
The Law Posted December 28, 2009 Author Report Share Posted December 28, 2009 Hey Law, can you get your hands on a TPR physics review book? I actually really like TPR's method of doing Dopplar Effect problems. It's easy, logical, and intuitive. Let me know. Thanks Pantaloons! I will check out TPR's method! Link to comment Share on other sites More sharing options...
janny_jan Posted December 29, 2009 Report Share Posted December 29, 2009 ask Sheldon Cooper...he has the best description of the Doppler effect...with a costume too!! Link to comment Share on other sites More sharing options...
The Law Posted December 29, 2009 Author Report Share Posted December 29, 2009 What are you? "here's a hint... ooooohweeeooooo" Sheldon Cooper... MILF HUNTER! hahahah Link to comment Share on other sites More sharing options...
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