PHYS 153 Homework: Set 2 Question 1 Several years ago a new bridge was built over the river Thames in London. I was there visiting my parents and so we decided to take a walk over it. However, whenever somebody walked over the bridge it started to sway uncontrollably. What was happening? If someone ran across the bridge, would the same thing happen? Explain Question 2 A wave has a frequency of 2 peaks per second and a wavelength of 4cm. Can this be an electromagnetic wave traveling through a vacuum? Explain. Question 3 Picture the following scene. You come home at night, switch on a light and put your evening meal in the microwave oven. Do the microwaves travel through the air faster than light? Do they have a longer or shorter wavelength than the light? Which has the larger frequency? Why is a microwave oven more efficient that a conventional oven? Question 4 Say I bring my dogs into the classroom. What information could you tell me about the dogs by examining electromagnetic waves with wavelengths in the range of 450nm to 650nm? Would you learn anything about the dogs by examining electromagnetic waves with a wavelength of 3km? Question 5 Identify the type of electromagnetic wave for each of the following wavelengths: 300nm, 1400nm, 300cm. Question 6 One afternoon, you’re looking out through the window of your house and the sun is shining brightly. What will happen to your skin? Explain your answer in terms of the resonance of the window’s glass. Question 7 In terms of electromagnetic waves, why do elephants have big ears? 

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