What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 417 nm
B) 257 nm
C) 344 nm
D) 565 nm
E) 610 nm
D
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Most of the deuterium formed right after the Big Bang
A) broke down into electrons and neutrons. B) was found in the globular clusters. C) turned into dark matter. D) is still around today. E) quickly burned into helium nuclei.
A particular automobile operates at an efficiency of 10%. Suppose that 20 gallons of gasoline are put into the auto's tank. Of this 20 gallons, how much will be "wasted" , i.e
, how much will be consumed to produce exhaust heat and in other ways that do not actually get the car down the road? A) 18 gallons B) 2 gallons C) 20 gallons D) 10 gallons E) 19 gallons
The standard kilogram is a platinum-iridium cylinder 39 mm in height and 39 mm in diameter. What is the density of the material?
A possible means for making an airplane radar-invisible is to coat the plane with an antireflective polymer. If radar waves have a wavelength of 3.84 cm, and the index of refraction of the polymer is n = 1.6, how thick would the coating be if a 180° phase change occurs at both surfaces?
a. 24 mm c. 32 mm b. 7.5 mm d. 6.0 mm