Which of the following is most sensitive to low-intensity light?
a. the green cones
c. the red cones
b. the blue cones
d. the rods
D
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The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels. If an electron at level 1 in a hydrogen atom absorbs 10.2 eV of energy, it moves to level 2. What typically happens next?
A) The electron returns to level 1 by emitting an ultraviolet photon with 10.2 eV of energy. B) The electron jumps to level 3 as soon as it absorbs any additional energy. C) The electron remains in level 2 until it absorbs an additional 10.2 eV of energy. D) A different electron drops into level 1 because it is now unoccupied.
The amount of time between successive passes of any given star across the meridian is
A) 23 hours 56 minutes. B) 24 hours. C) 365.25 days. D) 12 years. E) 26,000 years.
At room temperature, a typical person loses energy to the surroundings at the rate of 62.0 W
If this energy loss has to be made up by an equivalent food intake, how many Calories does this person need to consume every day just to make up this heat loss? A) 1040 Calories B) 1160 Calories C) 1280 Calories D) 1340 Calories E) 1400 Calories
According to present theories of light, in some experiments light seems to be:
a. composed of particles which can neither be created nor destroyed. b. a particle whose quantized energy depends on its velocity. c. a wave that moves from one place to another if there is material to vibrate. d. none of the above.