Why is the Earth's daytime sky blue?
A) Molecules scatter blue light more than red light.
B) The sky reflects the blue of the oceans and lakes.
C) Air molecules are blue in color.
D) Molecules absorb more red light than blue light.
A
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If two objects of different masses are dropped
near the Earth’s surface from the same height at the same instant and air resistance is neglected, we will find that a)the downward acceleration of the two objects must be quite different. b) both objects will experience the same gravitational force. c) both objects will strike the ground at the same time. d) the weight of both objects will be the same.
Where would the celestial equator appear to be located for an observer standing directly on one of the Earth's poles? Hint: Change your location on the Earth to the North Pole.
a. Directly overhead at the zenith. b. Between the zenith and the horizon. c. It would be parallel to and coincident with the horizon d. The celestial equator would not be visible.
What is a meteor?
A. the object that causes a "shooting star," but before it passes through the atmosphere B. any one of the large rocky bodies that orbit the Sun, primarily between Jupiter and Saturn C. a space rock that survives its fall through Earth's atmosphere and reaches the ground D. a glowing trail of hot gas and debris heated by friction as an object moves through the atmosphere
Iridescent colors in the pearly luster of an abalone shell are due to
A) refraction. B) diffraction. C) dispersion. D) polarization. E) interference.