E. [5] Diffraction Around an Obstacle Go to this website http://salfordacoustics.co.uk/sound-waves/diffraction and play the video(about half-way down the page): The image on the far left illustrates diffraction when the wavelength

is much larger than the sizeof the obstacle; the one in the middle is when the wavelength is somewhat larger than the size of the obstacle; the one on the right is when the wavelength is same size as the obstacle. [1] what is the definition of diffraction? b. [3] Create sketches after about 3 wavelengths have traveled over the obstacle (around 5 seconds) and label the acoustic shadow zones. Label each sketch, e.g. the first one should be labeled: A>> size of obstacle. c. [1] Which case has the smallest shadow zone and why?