ConceptTests_fa09

ConceptTests_fa09 - PHYS 3220 Concept Tests Fall 2009 In...

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PHYS 3220 Concept Tests Fall 2009
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In classical mechanics, given the state (i.e. position and velocity) of a particle at a certain time instant, the state of the particle at a later time … A) cannot be determined B) is known more or less C) is uniquely determined 2
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Is Einstein’s explanation of the photo effect enough to prove that energy quanta of radiation are particles? A) Yes B) No 2 ©University of Colorado, Boulder (2009)
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Which new concept did Einstein use to explain the photo effect? A) Light is a wave B) Light consists of energy quanta C) E = mc 2 D) Light consists of particles E) I don’t know 2 ©University of Colorado, Boulder (2009)
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Compton did observe the effect using X-rays. Would he be able to detect the effect (change in wavelength) with visible light too? A) Yes, and I know why B) Yes, but I guess C) No, and I know why not D) No, but I guess 2 ©University of Colorado, Boulder (2009)
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Compton effect: How many maxima will be detected if the detector is placed in forward direction? A) 0 B) 1 C) 2 D) 3 E) More 2 ©University of Colorado, Boulder (2009)
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For an electron with energy 25 eV, λ ~ 2.5 Angstrom. The slit separation in a standard double-slit experiment with a scintillation screen is d ~ 0.25 mm. What do you expect to see? A) A nice interference pattern with minima and maxima B) More or less a bright screen (no separation of minima and maxima) C) A black screen, since the electrons are diffracted by large angles 2 ©University of Colorado, Boulder (2009)
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Shown is a probability distribution P(j) for a discrete variable j . What is the average (mean) value <j> ? A) <j> = -2 B) <j> = -1 C) <j> = 0 D) <j> = 1 E) <j> = 2 2 ©University of Colorado, Boulder (2009) 0 1 2 3 -1 -2 -3 0.1 0.3 j P(j)
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Shown is a probability distribution P(x) for a continous variable x . What is the average (mean) value <x> ? 2 ©University of Colorado, Boulder (2009) 0 1 2 3 -1 -2 -3 1/8 3/8 x P(x) A) <x> = -2 B) <x> = -1 C) <x> = 0 D) <x> = 1 E) <x> = 2
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A) Prepare an ensemble of many identical particles and measure the positions of each of the particle. B) Measure the position of the same particle again and again many times. 2 ©University of Colorado, Boulder (2009) How does one measure an expectation value <x> ?
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A) None B) 1 and 2 C) 1 and 3 D) 2 and 3 E) all of them 2 ©University of Colorado, Boulder (2009) Requirements for the wave equation and its solution: 1. The equation has to be linear 2. The solution has to represent a frequency ω and wave vector k with ω=2πE/h and k =2π p /h 3. The solution must satisfy the dynamical equation E = p 2 /2m + V( r ,t) Which of these requirement has to be fulfilled?
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A) x 0 = -2 B) x 0 = 0 C) x 0 = 1 D) I cannot decide, but I know how to calculate it. 2
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ConceptTests_fa09 - PHYS 3220 Concept Tests Fall 2009 In...

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