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midterm1 example - Midterm#1 Astronomy 0846 Name TU id...

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Midterm #1 Astronomy 0846 Name: TU id #: Formulas: c = λ f T 6 10 3 × = λ 4 T F σ = ( ) 2 2 1 3 P M M D × + = 2 2 1 R M M G Force = Constants: Speed of light in vacuum c = 3x10 8 m/s Gravitational constant G = 6.67x10 -11 m 3 kg -1 s -2 1. The Sun’s apparent path around the celestial sphere is called 2. What is the frequency of a green laser beam with wavelength of 600nm? (1nm = 10 -9 m) 3. How many times brighter or fainter would a star appear if it were moved to: a) twice its present distance b) half its present distance c) ten times its present distance 4. In which region of the Earth’s atmosphere have you spend most of your life? 1
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5. Write down Newton’s laws of motion. 6. Explain the method of determining the age of rocks based on the natural radioactivity of some atoms. 7. We now know that the orbit of a stable planet around a star like the Sun is always in the shape of:
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