1. Short answer questions You should be able to give a short answer to each question posed below without any calculations. detailed (a) Why does Prof. Miller (and you, he hopes) think that the statement "light always travels more slowly in a material than in vacuum" is incorrect? Or, at least, why is this a potentially inadequate description of what really happens? (b) It's a windy day on the Quad and you and your friend are seated at benches 20 m apart while your friend is playing a tune on her guitar. The wind is blowing at a constant speed of 10 m/s directly from your friend to you. Is the sound you hear Doppler-shifted? If so, is it shifted to higher or lower frequencies? What about when you get up and run towards your friend at 10 m/s (for less than 2 seconds)? (c) How does the intensity of an EM wave depend on the electric field amplitude of that wave? (a proportionality relationship is sufficient) What is the magnitude of the com- ponent of a vector along an axis a that is oriented at an angle with respect to the direction of u? Put these two pieces of information together to describe the "intensity" of the vector observed along the axis a. 1