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Unformatted text preview: MidTerm IIb Name: Date: Phys224 Spring 2010 Dr. P. Hanlet Concept (3 points each) 1. A typical converging lens has the shape: (a) convexconcave (b) convexconvex (c) flatconcave (d) concaveconcave (e) concaveconvex 2. In the following diagram, the stickfigure fish stalker observes the fish in the water, and the fish observes the stalker in air. Does the fish stalker observe the fish at “a” or “b” and does the fish observe the stalker’s eyes at “c” or “d”? b c d a (a) b & d (b) a & d (c) b & c (d) a & c 3. A monochromatic source produces light at a wavelength λ = 650 nm in air. When the wave passes through water of index of refraction of n =1 . 65, the frequency of the wave in the water is then: (a) 7 . 62 × 10 14 Hz (b) 2 . 80 × 10 14 Hz (c) 6 . 50 × 10 14 Hz (d) 3 . 94 × 10 14 Hz (e) 4 . 62 × 10 14 Hz 4. As a space traveller, your spacecraft has headlights that allow you to view debris. As you pass something interesting, you decide to switch the lights on behind you to get a better look. If your spacecraft is travelling at 1 3 c relative to the nearest star, at what speed, relative to that same star, will the light be moving? (a) 2 . × 10 8 m/s (b) 2 . 7 × 10 8 m/s (c) 3 . 3 × 10 8 m/s (d) 3 . × 10 8 m/s (e) 1 . × 10 8 m/s 5. Positions of bright fringes from double slits are governed by which of the following equation(s)? (a) d sin θ = mλ (b) 2 L = ( m + 1 2 ) λ n 2 (c) n 1 sin θ 1 = n 2 sin θ 2 (d) any previous (e) none previous 1 6. In the example given in class in which a ground based observer in the S inertial reference frame watches a train get hit by two simultaneous lightening bolts at the front and rear of the train, which equation would be used to compute the time of the events as seen by a train based observer? (a) Δ t = γ Δ t (b) t ′ = γ parenleftBig t − vx c 2 parenrightBig (c) t = γ parenleftbigg t ′ + vx ′ c 2 parenrightbigg (d) Δ t ′ = γ parenleftbigg Δ t − v Δ x c 2 parenrightbigg (e) Δ t = γ parenleftbigg Δ t ′ + v Δ x ′ c 2 parenrightbigg 7. The figure below shows data taking from a Compton scattering experiment. The points are data and the lines are mathematical fits to the data. In each of the plots, (b), (c), (d), th first peak is the same the only peak in plot (a). This first peak is due to: (a) photons scattering from outer (valence) electrons (b) photons scattering from inner (core) elec trons (c) electrons scattering from outer (valence) electrons (d) electrons scattering from inner (core) electrons (e) electrons ejected from outer (valence) electrons 8. In the more general form of Einstein’s famous equation: E 2 = ( mc 2 ) 2 + ( pc ) 2 what is the interpretation of the second term on the right side of the equation?...
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 Spring '10
 Hanlet
 Electron, Energy, Sin, Compton scattering, Dr. P. Hanlet

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