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Unformatted text preview: IR begins at 3 THz and visible at 430 THz. UV starts at 750 THz. X-ray begins at 3 x 10 16 Hz and gamma-ray at 3 x 10 18 Hz. Calculate the corresponding wavelengths. 7. Explain how Roemer Frst measured the speed of light. 8. How many minutes are required for sunlight to reach the earth if the sun is 1.5 x 10 8 km from the earth? 9. On a clear night, when you look out in space, you really see history in real time. Explain why. 10. Calculate how many meters are in a light year. The nearest star Alpha Proxima is about 3.5 light years away. Convert this to meters. 11. The Magellan spacecraft in orbit around Venus uses radar to map the surface. It does this by timing how long it takes a radio signal pulse emitted by the spacecraft to return. It times one signal 0.051 s to return. Another is timed at 0.050 s. What is the difference in height of the terrain? Summer 2011 2 Problem Set 11...
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This note was uploaded on 06/02/2011 for the course GSCI 121 taught by Professor Niculescu,m during the Spring '08 term at James Madison University.
- Spring '08