On a clear day, the sky appears to be more blue toward the zenith (overhead) than it does toward the horizon. This occurs because

A) the atmosphere is denser higher up than it is at the earth's surface.
B) the temperature of the upper atmosphere is higher than it is at the earth's surface.
C) the sunlight travels over a longer path at the horizon, resulting in more absorption.
D) the atmosphere is more reddish over the ocean.


C

Physics & Space Science

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An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?

A. negative y direction B. positive y direction C. negative z direction D. positive z direction E. negative x direction

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In general, cold days are associated with

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A. 1 B. 2 C. 3 D. 4 E. 5

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