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
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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
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.
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
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?