How fast must a nonrelativistic electron move so its de Broglie wavelength is the same as the wavelength of a 3.4-eV photon? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
A) 1700 m/s B) 1600 m/s C) 2000 m/s D) 1900 m/s E) 1400 m/s
C
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A particle is confined to a one-dimensional box (an infinite well) on the x-axis between x = 0 and x = L. The potential height of the walls of the box is infinite
The normalized wave function of the particle, which is in the ground state, is given by ?(x) = sin , with 0 ? x ? L. What is the probability of finding the particle between x = 0 and x = L/3? A) 0.20 B) 0.22 C) 0.24 D) 0.26 E) 0.28
Why did Ptolemy have the planets orbiting Earth on "circles upon circles" in his model of the universe?
A) to properly account for the varying distances of the planets from Earth B) to explain why Venus goes through phases as seen from Earth C) to explain why the Greeks were unable to detect stellar parallax D) to explain the fact that planets sometimes appear to move westward, rather than eastward, relative to the stars in our sky E) to explain why more distant planets take longer to make a circuit through the constellations of the zodiac
The diagram below illustrates the layout and light path of a reflecting telescope of the ____________________ design
Which of the following is not a sustainable source of materials?
(a) Ore (b) Plants (c) Municipal waste (d) Microorganisms