If your pupils have a diameter of about 5 mm, about how many times more light gathering power does a telescope with a diameter of about 20 cm (8 inches) have than your pupils?
A. 4 times
B. 160 times
C. 16 times
D. 40 times
E. 1,600 times
Answer: E
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A standing wave is oscillating at 690 Hz on a string, as shown in the figure. What is the speed of traveling waves on this string?
A) 280 m/s B) 410 m/s C) 210 m/s D) 140 m/s
Which of the following best characterizes electrical conductors?
a. low mass density b. high tensile strength c. electric charges move freely d. poor heat conductors
The medium in which a wave travels
A) moves along with the wave. B) transmits the wave. C) inhibits the wave. D) reflects the wave.
Suppose the date is June 21 and the Sun never sets, just touching your northern horizon at midnight. Where are you?
A) the equator B) the Tropic of Cancer (latitude 23-1/2°N) C) the Tropic of Capricorn (latitude 23-1/2°S) D) the Arctic Circle (latitude 66-1/2°N) E) the Antarctic Circle (latitude 66-1/2°S)