A ray of light enters an equilateral prism made of material with n = 1.45. What angle of incidence, 
will cause the internally refracted ray to be parallel to the base of the prism?
A. 46.5
B. 30.0
C. 20.2
D. 5.70
E. this cannot happen
A. 46.5
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Why does one cycle of lunar phases take 29.53 days even though the Moon orbits Earth in 27.32 days?
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What information about an astronomical object can be determined by observing its spectrum?
A) its temperature B) its radial motion C) its chemical composition D) whether it has a strong magnetic field E) All of the above
In stage 6 or 7 of the formation of a large cluster of stars, a nebula is formed around the cluster. This happens because:
A) the number of stars is so great and so intense that the gas from the original cloud is ionized. B) the stars are out of their cocoons of dust and their radiation ionizes the gas from the original cloud. C) there are brown dwarfs everywhere in between the stars, so the gas is lit up by their low-intensity light. D) there are thousands of Sun-like stars with planets around them and the formation of planets ionizes the leftover gas. E) there are massive O and B stars emitting high energy photons that ionize the remainder of the cloud.
A beam of white light of a certain frequency is incident on a metal surface. If the work function of this surface is 2.20 eV, what frequency of light would give a maximum kinetic energy of 0.25 eV to the photoelectrons ejected from this surface?
A) 2.05 × 1014 Hz B) 1.02 × 1014 Hz C) 2.50 × 1014 Hz D) 3.53 × 1014 Hz E) 5.92 × 1014 Hz