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# Ch5 - Assignment Chapter 5 Class Astronomy I Date September...

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Assignment: Chapter 5 Class: Astronomy I Date: September 10 th , 2007 Review Questions 1. When Jupiter is undergoing retrograde motion as seen from Earth, would you expect the eclipses of Jupiter’s moons to occur several minutes early, several minutes late, or neither? Explain. The eclipses of Jupiter’s moons will appear several minutes early because during its retrograde motion, Jupiter is closer to Earth than when it is in direct motion. 2. Approximately how many times around the earth could a beam of light travel in one second? The circumference of the Earth is about 25,000 miles, and the speed of light is about 186282.397 miles per second. In one second, a beam of light travels around the Earth about 7.5 times. 3. How long does it take light to travel from the Sun to the Earth, a distance of 1.50 x 10 8 Km? Time equals rate divided by the distance; T = (1.50x10 8 ) / (3.00x10 5 ) = 700 Seconds 4. How did Newton show that a prism breaks white light into its component colors, but does not add any color to the light? Newton allowed sunlight to pass through a prism and sent the light through a second prism. Between the two prisms, he put a screen with a hole, and observed that the same color showed on the second prism. Therefore he concluded that prisms do not add colors but merely bend different colors through different angles. 5. For each of the following wavelengths, state whether it is in the radio, microwave, infrared, visible, ultraviolet, X-ray, or gamma-ray portion of the electromagnetic spectrum. Explain your reasoning. (a) 2.6 µ m, (b) 34 µ m, (c ) .54 nm, (d) 0.0032 nm, (e) 0.62 µ m, (f) 310 nm, (g) 0.012 m. a) 2.6 µm falls under infrared wavelength. b) 34 µm falls under infrared wavelength. c) 45 nm falls under visible light wavelength. d) 0.0032 nm falls under gamma ray wavelength. e) 0.62 µm falls under visible light wavelength. f) 310 nm falls under visible light wavelength. g) 0.012 m falls under microwave wavelength. 6. What is meant by the frequency of light? How is frequency related to wavelength? The frequency of a wave is the number of wave crests that pass a given point in one second. Because the light moves at a constant speed, if the wavelength is shorter, the frequency must increase, and if the wavelength is longer, the frequency can decrease. 7. A cellular phone is actually a radio transmitter and receiver. You receive an incoming call in the form of a radio wave of frequency 880.65 Mhz. What is the wavelength (in meters) of this wave?

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