Light of wavelength 687 nm is incident on a single slit 0.75 mm wide. At what distance from the slit should a screen be placed if the second dark fringe in the diffraction pattern is to be 1.7 mm from the center of the diffraction pattern?
A) 0.39 m
B) 0.47 m
C) 0.93 m
D) 1.1 m
E) 1.9 m
Answer: C
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Applications to Astronomy: The sun has apparent brightness B at the earth, which is 1.5 × 108 km away. What would be the apparent brightness of the sun at Pluto, which is 6.0 × 109 km from the sun?
A. 0.25 B B. 0.063 B C. 0.025 B D. 0.00063 B
The circuit below contains three 100-W light bulbs and a capacitor. The emf ? = 110V. At the instant the switch S is closed, which light bulb is brightest?
a.
A
b.
B
c.
C
d.
A and B
e.
All three are equally bright.
Which of the following is a "non-renewable" resource?
A) hydroelectric B) active solar heating C) wood D) photovoltaic electricity E) None of the above.
As measured from the Earth, a spacecraft is moving at speed 0.80c toward a second spacecraft moving at speed 0.60c back toward the first spacecraft. What is the speed of the first spacecraft as viewed from the second spacecraft?
a. 0.81c c. 0.38c b. 0.95c d. 0.20c