< Mentor Note -- thread moved to HH from the technical physics forums, so no HH Template is shown > Last week we had to conduct an experiment with the aim of determining the speed of sound. I decided to play with doppler effect. I was more or less sure what I had to do but then the teacher came and changed a whole set up. The outcome: I am currently very confused because I have to write a report on this experiment. Anyway, what I did was observing doppler effect in circular motion (with stationary source and moving observer). Basically speaking, I was swinging a microphone in a circle next to the sound emitting source that collected data into my computer. I also tried two different frequencies - 1000 and 4000Hz. So now I have four graphs of sound pressure against time: two of them show data when everything was stationary. And other two show the data with doppler effect. I can also convert them into amplitude versus frequency graphs. So.. what do I do next?? Is there a way of determining speed of sound out of that?