A chemical reaction is one in which
A. atomic nuclei change form.
B. a substance gets hot.
C. atoms change mass.
D. atoms get rearranged.
Answer: D
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Spherical Mirrors: A person's face is 30 cm in front of a concave spherical shaving mirror. If the image is an erect image that is 1.5 times as large as the object, what is the focal length mirror?
A. 20 cm B. 50 cm C. 70 cm D. 90 cm
Materials having resistance changes as voltage or current varies are called:
a. ohmic. b. inohmic. c. nonohmic. d. deohmic.
The diagram is of a simple spectroscope. If lens #1 were omitted, the resulting spectrum would be
1) much dimmer. 2) upside down. 3) no different. If, instead, the slit were opened too wide, the middle of the spectrum would appear 4) white. 5) much narrower. 6) black. 7) a broader yellow.
Silicon single crystals are grown using the _________technique.
Fill in the blank(s) with the appropriate word(s).