The hydrosphere covers about 50% of the Earth's crust
Indicate whether the statement is true or false
FALSE
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The wavelength of the red-pink line emitted by a laboratory sample of excited hydrogen is 656 nm. Taking a spectrum of a glowing nebula, you find that the same red-pink line of hydrogen appears at 662 nm. You conclude that the nebula
A. is moving away from us at about 1% the speed of light. B. is 1% hotter than hydrogen in the laboratory sample. C. is moving toward us at about 1% the speed of light. D. is 1% cooler than hydrogen in the laboratory sample.
What percentage of the solar nebula's mass consisted of rocky material?
A) 0 percent B) 0.4 percent C) 2 percent D) 20 percent E) 80 percent
When a light ray passes at a non-90° angle from water into air, it
A) bends toward the normal. B) bends away from the normal. C) travels much slower.
A rock is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration of objects in free fall is 1.5 m/s2 and there is no atmosphere. What is the maximum height reached by the laser?
A) 8.0 m B) 18 m C) 48 m D) 144 m