What is the lowest rung on the astronomical distance ladder?
A: Hubble Flow
B: Using Supernovae
C: Cepheid Variable
D: the Solar System
E: PNLF method
Ans: D: the Solar System
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Electromagnetic waves
A. need a medium such as water to propagate B. travel faster in a medium such as water than they do in a vacuum C. are longitudinal waves D. travel at the same speed in a vacuum regardless of wavelength
In which eon of Earth's history did life originate?
A) Proterozoic B) Phanerozoic C) Archean D) Hadean
What is a meteorite?
A) a streak of light caused by a star moving across the sky B) a comet that burns up in Earth's atmosphere C) a streak of light caused by a small particle from space burning up in Earth's atmosphere D) a fragment of an asteroid from the solar system that has fallen to Earth's surface E) a small moon that orbits one of the giant planets
About how high can water at sea level be theoretically lifted by a vacuum pump?
A) less than 10.3 m B) 10.3 m C) more than 10.3 m