One phenomenon that supports the quantum theory of radiation is
A) the transference of energy by a light beam.
B) the tiny flashes when a light beam strikes a screen.
C) interference effects with light.
D) the tiny flashes when an electron beam strikes a screen.
E) None of the above.
B
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Shown following are six different types of light that travel to Earth from the Sun. Rank these types of light from left to right based on the altitude in the atmosphere where they are completely absorbed, from highest to lowest (Earth's surface). If two (or more) of the choices reach the same altitude or the surface, rank them as equal by dragging one on top of the other(s).
A hammer hits a nail. The force of the nail on the hammer is
A. greater than the force of the hammer on the nail B. less than the force of the hammer on the nail C. equal to the force of the hammer on the nail D. zero
A thin infinitely large current sheet lies in the y-z plane. Current of magnitude Js per unit length along the z axis travels in the y-axis direction, which is up out of the page. Which diagram below correctly represents the direction of the magnetic field on either side of the sheet?
a.
b.
c.
A 4-cm-diameter cylindrical enclosure with black surfaces, as shown in the accompanying sketch, has a 2-cm hole in the top cover. Assuming the walls of the enclosure are at the same temperature, determine the percentage of the total radiation emitted from the walls that escapes through the hole in the cover.
GIVEN
• Cylindrical enclosure of black surfaces shown above
• Cylinder diameter (D) = 4 cm = 0.04 m
• Diameter of hole in top (Dh) = 2 cm = 0.02 m
FIND
• The percentage of the total radiation emitted from the wall which will escape through the hole in the cover (Fe4).
ASSUMPTIONS
• The walls of the enclosure are at the same temperature