What is the source of acid rain?
A) Acid rain is from dissolved carbon dioxide.
B) All rain is acid rain because rain has a pH is less than 7.
C) Rain is normally basic, but depending on the weather it can get slightly acidic.
D) All rain is acid rain because rain has a hydronium ion concentration greater than 10-7 M.
E) none of the above
Answer: E
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What is the average orbital speed of the Earth around the Sun? (Note: r = 1.5 x 1011 m and P = 3.16 107 s)
A. About 30 km/s. | ||
B. About 4.7 km/s. | ||
C. About 9.8 m/s2. | ||
D. 365 days. | ||
E. 1,000 km/s. |
From lowest energy to highest energy, which of the following correctly orders the different regions of electromagnetic radiation?
A) infrared, visible light, ultraviolet, x-rays, gamma rays, radio B) radio, infrared, visible light, ultraviolet, x-rays, gamma rays C) visible light, infrared, x-rays, ultraviolet, gamma rays, radio D) gamma rays, x-rays, visible light, ultraviolet, infrared, radio E) radio, x-rays, visible light, ultraviolet, infrared, gamma rays
The period of a pendulum is 2.0 s in a stationary inertial frame of reference. What is its period when measured by an observer moving at a speed of 0.60 c with respect to the inertial frame of reference?
Which is the first postulate of Bohr's model of the atom?
a. The angular momentum of the electron is quantized. b. Light is quantized. c. An electron radiates while it remains in an allowed orbit. d. An electron is not in a precise orbit. e. A photon is emitted whenever an electron jumps up one orbit.