In optical fibers of uniform density, light actually
A) curves in a direction parallel to the central axis of the fiber.
B) travels in straight-line segments.
C) travels along the outer surface of the fiber.
D) none of the above
Answer: B
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An optical fiber made of glass with an index of refraction 1.50 that is coated with a material with index of refraction 1.30 has a critical angle of
A) 90°. B) 41.8°. C) 60.0°. D) 50.2°. E) This combination will not work.
Kepler's first law of planetary motion states "The orbits of the planets are _____ with the Sun at one focus."
a. spheres b. ellipses c. circular d. rigid e. random
Current data suggest that ________ have at least one planet.
A) about 1 in 1 million stars B) about 1% of all stars C) about 10% of all stars D) most stars E) 100% of all stars
A block is pushed up a 20.0° frictionless incline with an initial speed 12.0 m/s. (a) How high up the plane does the block slide before coming to rest? (b) How much time does it take to return to its starting position?
What will be an ideal response?