If the eye can resolve points separated by 
when viewed at 12.0 inches, how many dpi is this? (dpi = dots per inch)
A. 250
B. 340
C. 380
D. 400
E. 590
C. 380
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Approximately how many comets are thought to be in the Oort cloud?
A) a thousand B) a million C) a billion D) a trillion E) a quintillion
Two harmonic sound waves reach an observer simultaneously. The observer hears the sound intensity rise and fall with a time of 0.200 s between the maximum intensity and the succeeding minimum intensity
What is the difference in frequency of the two sound waves? A) 10.0 Hz B) 0.200 Hz C) 5.00 Hz D) 2.50 Hz E) 1.25 Hz
A convex mirror has a focal length of ?20 cm. What is the position of the resulting image (in cm) if the image is upright and four times smaller than the object?
a. ?100 b. ?25 c. ?50 d. ?15 e. ?10
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.