Knowing that the dot near the upper center of the Sun in this photo is the planet Venus, you can conclude that the photo was taken
A) during a transit.
B) when Venus is at greatest western elongation.
C) when Venus is at greatest eastern elongation.
D) when Venus is at superior conjunction.
A) during a transit.
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The near point with age usually
A) steadily decreases. B) approaches 25. cm. C) steadily increases. D) increases and then decreases.
Suppose that a car traveling to the west begins to slow down as it approaches a traffic light. Which of the following statements about its acceleration is correct?
A) The acceleration is toward the east. B) Since the car is slowing down, its acceleration must be negative. C) The acceleration is zero. D) The acceleration is toward the west.
Treat the pupil of your eye as a circular aperture of diameter 3.5 mm. Light of wavelength 500 nm is used to view two point sources that are 283 m distant from you
How far apart must these two point sources be if they are to be just barely resolved by your eye, assuming that the resolution is limited by diffraction?
Blue light will not eject electrons from a certain metal; however, which one of the following may possibly eject electrons from that metal?
a. red c. infrared b. green d. ultraviolet