According to Wien's displacement law, if the absolute temperature of a radiating blackbody is doubled, then the peak wavelength emitted will change by what factor?
a. 4
c. 1
b. 2
d. 1/2
D
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A woman drives 75 m to the east. She stops, asks directions, and then drives 75 m to north. What is the direction of the displacement with respect to east?
a. 30 b. 53 c. 0 d. 45
Which of the following best describes the fundamental difference between two different chemical elements (such as oxygen and carbon)?
A) They have different numbers of protons in their nucleus. B) They have different names. C) They have different numbers of electrons. D) They have different atomic mass numbers.
A ball drops some distance and loses 30 J of gravitational potential energy. Do NOT ignore air resistance. How much kinetic energy did the ball gain?
A) more than 30 J B) exactly 30 J C) less than 30 J
The electromagnetic radiation that causes tanning:
a. can produce cancer. b. rarely passes through glass windows. c. is absorbed by ozone. d. is all of the above.