If a wave pulse is reflected from a free boundary, which of the following choices best describes what happens to the reflected pulse?
a. becomes inverted
b. remains upright
c. halved in amplitude
d. doubled in amplitude
b
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The strength of a rope depends on its
A) thickness. B) length. C) both of these
A 30-kg child sitting 5.0 m from the center of a merry-go-round has a constant speed of 5.0 m/s. While she remains seated in the same spot and travels in a circle, the work the seat performs on her in one complete rotation is
a. 0 J. b. 150 J. c. 1 500 J. d. 4 700 J. e. 46 000 J.
Mesons are always composed of
a. two quarks, one being classified as a quark and the other as an antiquark. b. a quark of one color and an antiquark of the anticolor. c. an up or down quark and a down or up antiquark. d. Two of the above choices are correct.
Two slits are illuminated with red light (l = 650 nm). The slits are 0.25 mm apart and the distance to the screen is 1.25 m. What fraction of the maximum intensity on the screen is the intensity measured at a distance 3.0 mm from the central maximum?
a. 0.94 b. 0.92 c. 0.96 d. 0.98 e. 0.99