In the double-slit experiment with light, suppose that the light source is turned on so briefly that only a single quantum of energy passes through the double slits. When it arrives at the screen, this energy is deposited
A) all over the white interference bands that normally appear in the double-slit experiment.
B) at one small point, which could be anywhere on the screen.
C) at one small point within the white interference bands.
D) all over one of the white interference bands.
E) at one small point, lying directly behind the slit through which the energy came.
C
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A) a globular cluster of stars B) an open cluster of stars C) a spiral galaxy D) a supergiant star E) a "beehive" cluster
A scientific experiment that showed a favorite model to be wrong should be disregarded
What will be an ideal response?
The diagram shown represents a portion of a wire in a circuit. A current is flowing in the wire in the direction shown. Under the convention that it is positive charge that flows the electric field points in the direction of the current. How can the electric field change direction where the wire bends?
a.
There is an excess of negative charge in the center of the wire.
b.
There is an excess of positive charge at the bottom end of the wire.
c.
There is an excess of negative charge at the right end of the upper portion of the wire.
d.
There is an accumulation of positive charge on the surface, particularly at the bend, such that the sum of electric fields gives the new electric field.
e.
There is an accumulation of electrical potential as the current traverses the wire: The higher potential in the lower half is the source of the field.
Which phase of the moon do you expect to see high in the sky at 6:00 P.M.?
A. the full moon B. the third quarter C. the new moon D. the first quarter