The very first stars in the universe were made of
A) hydrogen and helium. B) hydrogen and helium, 10% heavy elements.
C) hydrogen and helium, 0.1% heavy elements. D) hydrogen and helium, 2% heavy elements.
A
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Energy Levels: In the n = 1 state, the energy of the hydrogen atom is -13.6 eV. What is its energy in the n = 2 state?
A. -6.79 eV B. -4.53 eV C. -3.40 eV D. -1.51 eV
Estimate the speed of a galaxy away from us if it is 10 billion light-years from us and if the Hubble constant is 22 km/s per million light-years. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
A) 0.5c B) 0.1c C) 0.7c D) 0.9c E) 0.3c
If you locate the north celestial pole in your local sky and measure its altitude, then you will know
A) your latitude and longitude. B) your latitude and the direction that is due north for you. C) your longitude and the direction that is due north for you. D) your latitude and the local time. E) your latitude, longitude, and local time.
Which of the following describes parallax?
A) It is best measured over exactly one year intervals. B) It is inversely proportional to the distance to the star. C) It was first observed by Galileo with his new telescope. D) It is only applicable to objects within the solar system. E) It is more accurate as the distances to objects becomes greater.