midterm-ans - Cosmos & the Earth / v55.0202 /...

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Unformatted text preview: Cosmos & the Earth / v55.0202 / Fall 2007 / Midterm Exam Instructions: There are 35 questions on this exam, each with four possible choices. The last page contains a list of equations and numbers you might find useful. Record your answers on the bubble sheet. Use a separate sheet for any calculations. For numerical answers, pick the answer that is closest to correct. Each question counts equally. The most difficult questions are near the end, so I suggest you work in order. 1. What is the range of wavelengths of light that your eye can detect? (a) 0.1 to 1 nm (b) 50 to 100 nm (c) 400 to 900 nm (d) 1 to 5 mm 2. If the Earth were twice as massive as it is, but at the same radius around the Sun, how would the length of the year change? (a) It would not change. (b) It would be half as long. (c) It would be twice as long. (d) It would be four times as long. 3. What is the speed of light? (a) 3 km/s (b) 300 km/s (c) 300,000 km/s (d) 300,000,000 km/s 4. Does 900 nm wavelength light have a higher frequency or lower frequency than 450 nm wave- length light, and by how much? (a) They both have the same frequency. (b) The 900 nm wavelength light has lower frequency, by a factor of two. (c) The 900 nm wavelength light has higher frequency, by a factor of two. (d) The 900 nm wavelength light has lower frequency, by a factor of four. 5. Which of the following lists is ordered from lowest to highest frequency of light? (a) Ultraviolet, X-ray, infrared, radio, optical (b) Optical, infrared, radio, X-ray, ultraviolet (c) X-ray, ultraviolet, optical, infrared, radio. (d) Radio, infrared, optical, ultraviolet, X-ray. 2 6. If a laser emitting at 600 nm is observed to be emitting at 606 nm, how fast is it moving with respect to the observer? (a) 0.01 times the speed of light, towards the observer (b) 0.01 times the speed of light, away from the observer (c) 0.1 times the speed of light, towards the observer (d) 0.1 times the speed of light, away from the observer 7. Is the peak wavelength of emission of a star with a surface temperature of 5000 K longer or shorter than that of a star at 10,000 K, and by how much?...
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This note was uploaded on 04/06/2008 for the course SCIENCE V55.0202 taught by Professor Blanton during the Fall '07 term at NYU.

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midterm-ans - Cosmos & the Earth / v55.0202 /...

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