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Whatisthetemperatureofthis star a5000kelvin

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Unformatted text preview: d angular resolution of the Arecibo telescope at this wavelength? (A) 25 arcseconds (B) 45 arcseconds (C) 1.5 arcminutes (D) 34 arcminutes (E) 1.25 degrees 8. A refracting telescope has an objective lens with a focal length of 0.5 meters. If the telescope has a magnification of 10, what is the focal length of the eyepiece? (A) 2.5 (mm) (B) 5 (mm) (C) 10(mm) (D) 25 (mm) (E) 50 (mm) 9. The spectrum of a star peaks at a wavelength of 290 nanometers. What is the temperature of this star? (A) 5000 Kelvin (B) 10,000 Kelvin (C) 15,000 Kelvin (D) 20,000 Kelvin (E) 25,000 Kelvin 10. In a laboratory, a prominent absorption line of sodium shows up at a wavelength of 589 nanometers. In the spectrum of a distant star, this same line shows up at a wavelength of 591 nanometers. What does this tell you about that star? (A) Its surface temperature is hot enough to ionize the sodium atoms in its atmosphere. (B) The star is moving towards Earth (C) The sodium atoms in the stars atmosphere contain additional neutrons in their nuclei (D) The star is moving away from Earth (E) The star is cold enough that the sodium atoms in its atmosphere have combined with chlorine atoms to form sodium chloride. 11. An electron in a hydrogen atom drops from the n=4 state to the n=3 state and emits a photon. What is the wavelength of this photon? (A) 1870 (nm) (B) 1280 (nm) (C) 820 (nm) (D) 2250...
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This test prep was uploaded on 02/22/2014 for the course ASTRO 1 taught by Professor Antonucci during the Spring '08 term at UCSB.

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