A light ray is partially reflected and partially refracted at a boundary between two media, the upper one having index of refraction n, the lower one having index of refraction n', as shown in the figure. The reflected ray is perpendicular to the refracted ray when
A.
.B.
.C.
.D.
.E.
.Answer: A
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The planet Neptune is, on average, about 4.5 billion km from the sun. How long does it take light from the sun to reach Neptune? (Recall that the speed of light is about 300,000 km/s)
A) about 4 days B) about 4 hours C) about 4 seconds D) about 4 minutes
A 1200 W toaster does enough work in 10 seconds to raise an 80 kg man to a height of 15 meters
What will be an ideal response?
A standard candle is
A) a 7-cm-long wax candle. B) another name for a main-sequence star. C) another name for a barred-spiral galaxy. D) a light source of known luminosity.
An electron is released form rest in a region of space where a uniform electric field is present. Joanna claims that its kinetic and potential energies both increase as it moves from its initial position to its final position. Sonya claims that they both decrease. Which one, if either, is correct?
a. Joanna, because the electron moves opposite to the direction of the field. b. Sonya, because the electron moves opposite to the direction of the field. c. Joanna, because the electron moves in the direction of the field. d. Sonya, because the electron moves in the direction of the field. e. Neither, because the kinetic energy increases while the electron moves to a point at a higher potential.