Suppose that the light from the sun suddenly shut off all over the sun, precisely at noon, as measured by clocks placed near the sun. Viewed from Earth, how would this appear? (HINT: It is about 8 light-minutes to the sun.)
A) Nothing unusual would happen, as viewed from Earth.
B) At noon, all sunlight would suddenly cease.
C) At about 8 minutes past noon, all sunlight would suddenly cease.
D) After about 8 minutes, the sun would turn into Daffy Duck.
E) At about 8 minutes past noon a small black spot would appear in the center of the sun, and this black spot would rapidly spread out over the entire sun.
Question 2
A coating is being applied to reduce the reflectivity of a pane of glass to light with a frequency of 5.75 1014 Hz that is incident normally on the pane.
If the material has an index of refraction of 1.375 and the glass has an index of refraction of 1.537, what is the minimum thickness the coating should have?
(c = 3.00 108 m/s)
A) 60.0 nm
B) 94.9 nm
C) 145 nm
D) 65.2 nm
E) 80.1 nm
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