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Electrodynamics, Physics 323 Second midterm 8.20 am, May 19, 2004
Spring 2004 Instructor: David Cobden
You have 60 minutes. End on the buzzer at 9.20. Answer all 12 questions.
Write your name on every page and your ID on the first page.
Write all your working on these question sheets. Use this cover page for extra working (you might get credit
for it.)
It is important to show your calculation or derivation. You may not get full marks just for stating the correct
answer if you don’t show how you get it.
Watch the blackboard for corrections or clarifications during the exam.
This is a closed book exam. No notes allowed. No calculators.
c = 3 × 108 m/s.
Don’t turn this page until I say ‘go’.
Why the Sky is Blue by John Ciardi
I don't suppose you happen to know
Why the sky is blue? It's because the snow
Takes out the white. That leaves it clean
For the trees and grass to take out the green.
Then pears and bananas start to mellow,
And bit by bit they take out the yellow.
The sunsets, of course, take out the red
And pour it into the ocean bed
Or behind the mountains in the west.
You take all that out and the rest
Couldn't be anything else but blue.
Look for yourself. You can see it's true.
