During the double-slit experiment with light, the region between the slits and the screen contains
A) an electromagnetic field.
B) electrons.
C) photons.
D) a matter field.
E) None of the above.
A
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If the universe is closed and finite, then
a. the universe has a center and an edge. b. the universe will expand forever. c. the final fate of the universe will be very cold and of extremely low density . d. the space-time of the universe is negatively curved. e. none of the above
Which person’s watch (if any) measures the coordinate time ?t between those events in some inertial frame?
A. The rider in the merry-go-round B. The person standing on the ground C. Both D. Neither
When the reflection of an object is seen in a plane mirror, the image is
a. real and upright. b. real and inverted. c. virtual and upright. d. virtual and inverted.
If R = 4.0 k?, C = 3.0 mF, ? = 15 V, Q = 12 mC, and I = 2.0 mA, what is the potential difference Vb ? Va?
a.
+3.0 V
b.
?19 V
c.
?3.0 V
d.
+27 V
e.
+21 V