Radio waves are diffracted by large objects such as buildings, whereas light is not noticeably diffracted. Why is this?
A) Radio waves are unpolarized, whereas light is normally polarized.
B) The wavelength of light is much smaller than the wavelength of radio waves.
C) The wavelength of light is much greater than the wavelength of radio waves.
D) Radio waves are coherent and light is usually not coherent.
E) Radio waves are polarized, whereas light is usually unpolarized.
B
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The principal greenhouse gases in our present atmosphere are:
A) hydrogen and helium. B) hydrogen sulfide and carbon disulfide. C) water vapor and carbon dioxide. D) methane and ammonia. E) sulfuric acid vapor and carbon dioxide.
What is the formula of a compound formed from the ions M1+ and X1-?
a. M2X b. MX c. M2X2 d. MX2
If R = 2.0 k?, C = 4.0 mF, ? = 8.0 V, Q = 20 mC, and I = 3.0 mA, what is the potential difference Vb ? Va?
a.
+7.0 V
b.
+19 V
c.
+9.0 V
d.
?3.0 V
e.
?14 V
Two ways that the temperature of a gas can be increased are by __________ and __________
Fill in the blank(s) with correct word