An optical fiber made of glass with an index of refraction 1.50 is coated with a plastic with index of refraction 1.30. What is the critical angle of this fiber at the glass-plastic interface?

A) 90.0°
B) 41.8°
C) 60.1°
D) 50.2°
E) 61.1°


Answer: C

Physics & Space Science

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Show that the effective conductance. A1 F 1-2 for two black parallel plates of equal area connected by re-radiating walls at a constant temperature is


GIVEN
• Two black parallel planes of equal area connected by re-radiating walls at a constant temperature
FIND
• Show that

SKETCH

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In a color television tube, electrons are accelerated through a potential difference of 20,000 volts. With what velocity do the electrons strike the screen?

What will be an ideal response?

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The total number of stars in the observable universe is about ________

A) the same as the number of grains of sand on all the beaches on Earth B) the same as the number of grains of sand in a school sandbox C) 100 billion D) the same as the number of atoms that make up the Earth

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In a thunderstorm, the falling rain creates

A) an updraft that generates a storm cell within the cloud. B) a downdraft, chilling the air and making it denser than the surrounding air. C) a downdraft, chilling the air and making it less dense than the surrounding air. D) an updraft, chilling the air and making it denser than the surrounding air.

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