An optic fiber is made of clear plastic with index of refraction of 1.50, surrounded by air. For what angles of incidence ? will light remain within the plastic fiber?
A) ? < 38.3° B) ? < 41.8° C) ? ? 21.1° D) ? > 41.8° E) ? > 38.3°
D
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Suppose a planet is discovered by the Doppler method and is then discovered to have transits. In that case, we can determine all the following about the planet except
A) its precise mass. B) its density. C) its physical size (radius). D) its rotation period. E) its orbital period.
An element is distinct because of its number of
A) protons. B) neutrons. C) electrons. D) the total mass of all the particles. E) none of the above
How are T Tauri stars characterized observationally?
A) by sudden changes in their brightness B) by very high temperatures C) by very high magnetic fields and large starspots D) by very rapid rotation E) They are newly-formed stars that are short period binaries.
In what way would you expect a rainbow from oil droplets to differ from a rainbow caused by water droplets, assuming the oil has a greater index of refraction than water? (Hint: See page 377 of your textbook)
a. There would be no change. b. Light rays would bend more sharply, so the arc of the rainbow would have a smaller radius. c. Light rays would bend less sharply so that the arc of the rainbow would have a larger radius.