The frequency of a note one octave higher in pitch than a 440-Hz note is
A) 1760 Hz.
B) 880 Hz.
C) 440 Hz.
D) 220 Hz.
E) 110 Hz.
Answer: B
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Two equal point charges are separated by a distance d. When the separation is reduced to d/4, what happens to the force between the charges?
A. it decreases by a factor of 4 B. it increases by a factor of 4 C. it increases by a factor of 8 D. it increases by a factor of 16 E. it increases by a factor of more than 16
Which of the following wavelength regions can be studied with telescopes on the ground?
A) radio, visible, and very limited portions of the infrared and ultraviolet regions B) all light with wavelengths longer than ultraviolet wavelengths C) all light with wavelengths shorter than infrared wavelengths D) infrared, visible, and ultraviolet light
Velma is in a rocket ship moving north past Mort at half of lightspeed relative to Mort. She fires a laser beam forward from the front of her ship. Mort sees the laser beam move at
A) slightly faster than c. B) slightly slower than speed c [lightspeed]. C) 1.5c. D) c. E) 0.5c.
There are no tides to be seen in the community swimming pool because
A) gravitation on the small mass of water is negligibly small. B) it is shallow compared to the ocean. C) all parts of it are practically the same distance from the Moon. D) they are masked by the much stronger pull of Earth's gravity. E) But there are, at nighttime.