True or False: When a photon scatters off an electron, the photon loses energy
1.False
2.True
2
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Total Internal Reflection: Lucite has an index of refraction of 1.50. What is its critical angle if it is in air?
A. 1.16° B. 15° C. 41.8° D. 65.2° E. 87.4°
The radiation curve for a blue hot star peaks in the
A) infrared region. B) red region. C) yellow region. D) ultraviolet region. E) none of the above
You want to produce a casting of sterling silver that is silver plus 13 atomic % copper. Pure silver is too soft for many applications, and adding 13 atomic % copper strengthens the silver without significantly changing the color. To produce the sterling silver casting, you are going to melt commercially pure silver and copper in a furnace, and then you will pour the liquid metal mixture into a mold. The following questions relate to this alloy.
(a) In selecting a furnace, what must be the minimum value of the high-temperature capability of your selected furnace?
(b) In transferring the liquid metal from the furnace to the mold, what is the minimum temperature that the metal can reach so that none of the metal has solidified?
(c) After the casting has cooled to room temperature, what phases are present, what is the equilibrium chemical composition (Ci) of each phase present, and what is the atom fraction (fi) of each phase present?
Acceleration due to gravity on the Moon is less than on Earth, and the Moon is smaller than Earth. This means that compared to an Earth satellite, a satellite in close orbit about the Moon would travel
A) slower. B) faster. C) the same. D) need more information