The temperature of the photosphere is about
A) 3,200 K.
B) 5,800 K.
C) 11,000 K.
D) one million K.
E) ten million K.
B
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Which terrestrial world experiences the greatest change between its daytime temperature and night temperature?
A) Mercury B) Venus C) Earth D) Mars E) the Moon
What type of spectrum is emitted by a hot, tenuous gas?
A. emission-line B. continuous C. absorption-line D. None of these choices are correct.
A player hits a ball with a bat. If action is the force of the bat against the ball, reaction is the
A) air resistance on the ball. B) weight of the ball. C) force that the ball exerts on the bat. D) grip of the player's hand against the ball. E) weight of the bat.
A porch roof sloping at 45° accumulated snow to a depth of 30. cm. The roof measured 3.0 m × 5.0 m. If the density of snow was 15. kg/ m2, what was the weight of the snow, in pounds, on the roof?
A) 210 lb B) 74 lb C) 56 lb D) 148 lb E) 105 lb