Which of the following devices make use of the photoelectric effect?
a. digital cameras
b. photocopiers
c. laser printers
d. solar cells
e. all of the above
E
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Radioactivity Basics: A nuclear reaction is shown: 
B + 
He ? 
H + ? . Which one of the following isotopes is the missing nuclear product?
A. 
F
B. 
N
C. 
C
D. 
N
E. 
N
Where do scientists find the key evidence linking the extinction of the dinosaurs to the impact of an asteroid or comet?
A. in sediments that surround a large crater in Mexico B. in sediments separating rocks from the time when dinosaurs existed from those deposited after dinosaurs were no longer found C. in rock brought up by drilling deep into Earth's mantle D. in sediments found on the ocean bottom near mid-ocean ridges E. in rocks returned from craters on the Moon
In radioactive decay, the original nucleus before decay is referred to as the
A) daughter isotope B) parent isotope C) mother-in-law isotope D) progenitor isotope
A kilowatt-hour is a unit that measures
a. work per unit of time. b. energy. c. power. d. work × time.