The Lewis symbol of which of the following elements has a single dot on each of the four sides of the element's symbol?
a. Helium
b. Carbon
c. Beryllium
d. None of these
b
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Comparing Mercury to the Earth's Moon:
A. Mercury is more than 100 times the mass of Earth's Moon. B. Mercury is only about 1/100th the mass of Earth's Moon C. they both take the same time to complete one orbit around the Sun. D. they both have little atmosphere and a similarly cratered surface. E. Since Mercury has so many active volcanoes, the craters on its surface have almost all been wiped away, while the Moon's craters remain.
Because of their short lifetimes, very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the Earth. Yet we detect large numbers of muons at ground level because of
a. time dilation. b. length contraction. c. the equivalence of mass and energy. d. the principle of relativity. e. none of the above.
An asteroid revolves around the Sun with a perihelion 0.5 AU and an aphelion of 7.5 AU. What is its period of revolution?
A. 4 years B. 8 years C. 16 years D. 32 years E. 64 years
Two in-phase loudspeakers are 3.00 m apart. They emit sound with a frequency of 490 Hz
A microphone is placed half-way between the speakers and then moved along the line joining the two speakers until the first point of constructive interference is found. At what distance from that midpoint is that first point? The speed of sound in air is 343 m/s. A) 0.175 m B) 0.350 m C) 0.500 m D) 0.700 m E) There is no point in that line where constructive interference occurs.