Question 1. Draw a picture of a moving source and the waves surrounding it according to what you observed in this experiment. How does the spacing of the wavefronts in front of the source compare to those behind it?  (Note:  To draw a picture, you can use MS Paint or any other drawing software you may have. You can save the image file as a jpg or a bmp and then insert it into the Word document.)

Question 2. Imagine a small observer is positioned in front of the cork in your picture above. As the cork approaches, the observer measures the wavelength of the waves passing by. How does this wavelength compare to that measured from behind the source?

Question 3.. Imagine that this same observer measures the frequency of the waves instead of wavelength. How does the frequency measured in front of the source appear to the observer compared to the frequency measured from behind?

Question 4.  How do these results help explain why a car’s engine sounds different as the car approaches you compared with after it passes?