Monochromatic light (? = 500 nm) is incident on a soap bubble (n = 1.4) that is 50 mm thick. What is the change of phase of the light reflected from the front surface?
A. 0
B. 180°
C. ?/2
D. ?/2
E. 55°
Answer: B
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The best answer to both the flatness and horizon problems is:
A) the Steady State Theory. B) the GUT theory. C) the inflationary epoch. D) dark energy. E) decoupling.
Which of the following is not evidence for the Big Bang?
A. The background of microwave radiation B. The expansion of the universe C. The ratio of hydrogen to helium observed in stars D. The existence of protons and neutrons
Work Done by a Gas: While 3.0 moles of gas expand from an initial volume of 0.040 m3 to a final volume of 0.085 m3, the temperature of the gas is kept fixed at 300 K. How much work does the gas do during this expansion? (R = 8.31 J/mol ? K)
A. 5.6 kJ B. 6.6 kJ C. 7.6 kJ D. 8.6 kJ E. 14 kJ
What made Maxwell's equations conflict with Galilean invariance while Newton's laws did not conflict?
a. They depended on acceleration rather than velocity. b. They depended on velocity rather than acceleration. c. They dealt with non-inertial systems rather than inertial systems. d. They dealt with inertial systems rather than non-inertial systems. e. They dealt with electromagnetic effects rather than mechanics.