A camera uses a biconvex lens made of glass with an index of refraction of 1.60 and has a radius of curvature of 12. cm for the 1st surface and 24. cm for the 2nd
(a) What is the focal length of this lens when used in air?
(b) If used under water (n = 1.33), what is the focal length?
(a) 13. cm
(b) 39. cm
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In the chrome plating of steel automotive parts, it is found that it is possible to have a high-quality coating with a current density of 0.4 A/cm 2 by heating the chromic acid solution to 65°C and using a chrome anode.
In order for two objects to have the same temperature, they must
a. be in thermal equilibrium. b. be in thermal contact with each other. c. have the same relative "hotness" or "coldness" when touched. d. have all of the properties listed above. e. have only properties (b) and (c) above.
Approximately how large in diameter would the star Betelgeuse be on this same scale?
A) 40 centimeters (the size of a typical beach ball) B) 6 meters (roughly the size of a dorm room) C) 130 meters (slightly larger than a football field) D) 3 kilometers (the size of a small town)
Why wasn't the intracluster medium in galaxy clusters discovered until the 1960s?
A) We did not know how much dark matter existed before then. B) We didn't have the resolution to observe galaxy clusters until then. C) The Milky Way was blocking our view of distant galaxy clusters. D) The medium emits X-rays, which are blocked by the Earth's atmosphere and require X-ray satellites in space in order to be observed. E) Radiation emitted by the medium was so dim that we couldn't detect it until we built much larger telescopes.