Here are some more questions that will help you get ready for the test on Thursday. They are due for HW tomorrow. page 420 in packet I gave you 20-23 and the think and explain section 7-10.
Here are some examples of the word problems I would give you.
1. Say we could stand on a distant star and shine a flashlight. If the star is 250 light years away, how long will it be until we see the light? How many Km is this away from us?
2. If red has a wavelength of 700nm and blue has a wavelength of 450 nm how much faster does blue light travel than red light? What is the amount of difference between their frequencies? (look up the difference between a nanometer and a meter do not email me for that).
3. Light is traveling for four earth years and then finally reaches Earth. How far away is the light source in Km?
4. You are watching a display of fireworks when your favorite display goes up. After it explodes at an altitude of 250m from the surface of the earth, how long will it take for you to see it?
5. The frequency of a microwave is 9.5 x 10^9Hz. What is the wavelength that a microwave operates at?
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