A camera lens that covers the film with a wider field of view than that of the eye and through which objects appear smaller is referred to as a
A)
normal lens.
B)
telephoto lens.
C)
wide-angle lens.
D)
zoom lens.
E)
digital lens.
C
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When waves interfere, the result is ________ original waves ("they interfere")
A) always smaller than B) always larger than C) always the same as D) sometimes smaller than, sometimes larger than
A heat engine operates between 800 K and 300 K, but its efficiency is only 80% of the maximum possible. What is the actual efficiency of the engine?
A) 30% B) 70% C) 38% D) 50% E) 36%
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a. 0. b. 0.8 m/s towards the right. c. 0.8 m/s towards the left. d. 2.4 m/s towards the right. e. 2.4 m/s towards the left.
The best determination of the Hubble constant using Cepheid variables found in distant galaxies by the Hubble telescope suggests
a. that the Hubble constant is about 0.07 km/sec/Mpc. b. that the Hubble constant is about 7 km/sec/Mpc. c. that the Hubble constant is about 70 km/sec/Mpc. d. that the Hubble constant is about 700 km/sec/Mpc.