Suppose you look at a spectrum of visible light by looking through a prism or diffraction grating. How can you decide whether it is an emission line spectrum or an absorption line spectrum?
A) The only way to decide is to make a graph of the intensity of the light at every wavelength, and then analyze the graph carefully.
B) An emission line spectrum consists of a long bright line, while an absorption line spectrum consists of a long dark line.
C) An emission line spectrum consists of bright lines on a dark background, while an absorption line spectrum consists of dark lines on a rainbow background.
D) The emission line spectrum is produced by electrons jumping up in energy level, while the absorption line spectrum is produced by electrons jumping down in energy level.
C
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According to the _____, the Moon formed elsewhere in the solar nebula and was later taken by Earth
A) condensation hypothesis B) fission hypothesis C) capture hypothesis D) large-impact hypothesis
If two straight lines start out parallel but eventually cross, then they must be in a
A) flat geometry. B) saddle-shaped geometry. C) spherical geometry. D) spacetime geometry.
Two identical circuits have a capacitor in series with a resistor. In circuit A, the resistor has resistance R, while in circuit B, its resistance is 4R. The capacitors are identical. Each capacitor begins fully charged, and each circuit is open. When each circuit is connected (i.e. the switch in them is closed) the capacitor will fully discharge. If a time t is required for circuit A’s capacitor to fully discharge, what time will be required for circuit B’s capacitor to do the same?
A. 4t B. 0.5t C. 0.25t D. t E. 2t
A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person will get to the ground first?
A) The light woman B) The heavy man C) Both should arrive at the same time. D) not enough information