Two pulses of light, one red and one blue, have the same energy. The pulse with the greater number of photons is the
A) red pulse.
B) blue pulse.
C) both the same
Answer: A
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What is the least value for an index of refraction?
A. 0 B. 0.5 C. 1 D. just less than 1 E. (1/2)1/2
In the case of constant acceleration, the average velocity equals the instantaneous velocity:
a. at the beginning of the time interval. b. at the end of the time interval. c. half-way through the time interval. d. three-fourths of the way through the time interval.
How do the speeds at which we are moving with Earth's rotation and orbit compare to the speeds of more familiar objects?
A) Earth's rotation carries most people around the axis faster than a commercial jet travels, and Earth's orbit carries us around the Sun faster than the Space Shuttle orbits Earth. B) Earth's rotation carries most people around the axis at about the speed of a commercial jet, and Earth's orbit carries us around the Sun at a higher speed. C) Earth's rotation carries most people around the axis at about the speed of a car on the freeway, and Earth's orbit carries us around the Sun at about the speed of a commercial jet. D) Earth's rotation carries most people around the axis at about the speed at which the Space Shuttle orbits Earth, and Earth's orbit carries us around the Sun at nearly the speed of light.
Pascal's Principle: The water pressure to an apartment is increased by the water company. The water enters the apartment through an entrance valve at the front of the apartment. Where will the increase in the static water pressure be greatest when no water is flowing in the system?
A. at a faucet close to the entrance valve B. at a faucet far from the entrance valve C. It will be the same at all faucets. D. There will be no increase in the pressure at the faucets.