There are about
A) 10 different types of atoms.
B) 100 different types of atoms.
C) a thousand different types of atoms.
D) an unlimited number of different types of atoms.
Answer: B
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In what region of the Sun is solar energy generated?
A) the outer surface B) the inner surface C) the mid-interior D) the inner core
Two beams of coherent light start out at the same point in phase and travel different paths to arrive at point P. If the maximum destructive interference is to occur at point P, the two beams must travel paths that differ by
A) a whole number of wavelengths. B) an odd number of half-wavelengths. C) a whole number of half-wavelengths.
Diagram 7-1 shows a plot of the temperature of the Sun as a function of distance above the bottom of the photosphere. What is the temperature of the Sun at a distance of 2,000 km?
________ can be used to measure the ________ of nearby stars.
A. Interferometry; radius B. The method of standard candles; brightness C. Parallax measurements; radius D. Spectroscopy; brightness