Two in-phase loudspeakers are placed 6.00 m apart along one wall of a room. They emit sound with a frequency of 512Hz
Starting at the location of one of the loudspeakers, a microphone is moved in a direction perpendicular to the wall until constructive interference is detected for the first time. How far is the microphone from the wall at that point? The speed of sound in air is 330 m/s. A)
0.141 m
B)
0.664 m
C)
0.203 m
D)
0.138 m
E)
0.282 m
C
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Magnetic confinement is used in controlled fusion experiments to
a. provide neutrons. b. accelerate nuclei. c. control a plasma. d. excite nuclei into higher energy levels. e. inject energy into nuclei.
Mercury features long, steep cliffs in its crust called "scarps" which probably formed
A. by erosion from high solar winds. B. like giant wrinkles as the crust cooled and shrank. C. after impacts from a planetesimal or asteroid. D. as plates of crust shifted as a result of massive earthquakes at a fault. E. from floods of running water left to evaporate after comet impacts.
Spectra from neutral atoms compared with spectra from ionized atoms of the same element
A) are the same. B) are slightly redshifted. C) are slightly blueshifted. D) have different sets of spectral lines. E) have the same sets of spectral lines but different widths for those lines.
Which of the following is a prototype of a new class of objects defined by the International Astronomical Union (IAU) as dwarf planets?
A) Pluto B) Uranus C) Titan D) Triton