Exam2MCLABsol - Name __________________________ Student ID...

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Unformatted text preview: Name __________________________ Student ID _______________ Score __________ Last First NOTE: In all Questions choose the answer that is the closest!! Question I. (19 pts) Lens and Mirrors 1. (3 pts) The top of the image produced by the converging lens, shown, is at which point? (F marks the two focal points.) (A) (B) (C) (D) (E) 2. (3 pts) The image of the encircled point on the object formed in the converging lens, shown, is at which circle? (F marks the two focal points.) (A) (B) (C) (D) (E) 3. (3 pts) When an object is closer to a concave mirror than the mirror's focal point, the A. magnification is less than one. B. image distance is greater than the object distance. C. image is upright just as is the object. D. image is inverted. E. magnification is exactly one. 4. (5 pts) A converging lens has a focal length f. Of the choices given, the only way to get a magnification of -1 or 1 is to A. place a real object at the focal point. B. place a real object at a distance 2f from the lens. C. place a real object at a distance 3f from the lens. D. Magnifications from a converging lens can never be negative. E. None of these is correct. Phys 123A Exam II May 9, 2008 Name __________________________ Student ID _______________ Score __________ Last First 5. (5 pts) Thin converging lenses 1 and 2 have focal points F1 and F2 respectively. After assing through the two lenses, the ray from the object shown passes through which point? (A) (B) (C) (D) (E) Question II (18 pts) Light, Reflection, and Refraction 6. (5 pts) Mission Control sends a brief wake-up call to astronauts in a distant spaceship. Five seconds after the call is sent, Mission Control hears the waking groans of the astronauts. How far away (at most) from the earth is the spaceship? A. 7.5 108 m B. 15 108 m C. 30 108 m D. 45 108 m E. There is no upper limit on the distance. 7. (5 pts) A glass block with index of refraction 1.50 is immersed in water whose index of refraction is 1.33. The critical angle (in degrees) at the glasswater interface is (A) 6.5 (B) 41.9 (C) 48.8 (D) 56.3 (E) 62.5 8. (3 pts) The rays in the figure are reflected and refracted at the front and back surfaces of the glass. Which of the following is true of the angles (not to scale in diagram) of these rays relative to normal? 1 2 3 Air Glass Air 4 1=2=3=4 1 = 2; 3 = 4; but 1 3 1 = 2 = 4; but 4 3 1 = 4; but 2 4 12 34 A. B. C. D. E. Phys 123A Exam II May 9, 2008 Name __________________________ Student ID _______________ Score __________ Last First 9. (5 pts) A ray of unpolarized light is incident on a glass block at an angle of incidence in such a way that the reflected ray is completely plane polarized. Which ray best represents the refracted ray? (A) (B) (C) (D) (E) Question III (18 pts) Waves 10. (5 pts) While you are standing on a corner, a police car with a 1-kHz siren drives past you at 40 m/s with its siren on. The speed of sound is 340 m/s. After the car has passed, the frequency you hear approaches A. B. C. D. E. 1.10 kHz 1.09 kHz 1.00 kHz 895 Hz 919 Hz 11. (3 pts) The sources S1 and S2 are coherent sources, and the circular arcs, shown, represent wave crests. Which position more closely corresponds to a path difference of two wavelengths? (A) (B) (C) (D) (E) Phys 123A Exam II May 9, 2008 Name __________________________ Student ID _______________ Score __________ Last First 12. (5 pts) The air in a closed organ pipe vibrates as shown. The length of the pipe is 3.0 m. The frequency of vibration is 80 Hz. The speed of sound in the pipe is approximately (A) 80 m/s (B) 0.16 km/s (C) 0.24 km/s (D) 0.32 km/s (E) 0.96 km/s 13. (5 pts) The fundamental frequency of a pipe that has one end closed is 256 Hz. When both ends of the same pipe are opened, the fundamental frequency is (A) 64.0 Hz (B) 128 Hz (C) 256 Hz (D) 512 Hz (E) 1.02 kHz Phys 123A Exam II May 9, 2008 Name __________________________ Student ID _______________ Score __________ Last First Question IV. (25 pts) Lab Standing waves on a string BE SURE TO SHOW ALL YOUR WORK WITH UNITS FOR FULL CREDIT. Consider the vibrator frequency to be 120 Hz in the lab setup. The wavelength is the same in parts a through e. vibrator weighted stand table pulley string weight L=0.930 m a) (3 pts) What is the wavelength of the standing wave shown? = 0.620 m b) (3 pts) What is the tension in the string for a hanging mass of 0.750 kg? tension = mg = (0.750kg)(9.80m/s2) c) (3 pts) Is the wave in the string longitudinal or transverse? transverse d) (8 pts) What is the mass per unit length of the string? v = f and v2 = T/ thus =T/{(0.620 m)2 (120 Hz)2} = 1.30 x 10-3 kg/m e) (3 pts) What is the period of standing wave shown? T = (1/f) = 8.33 ms f) (5 pts) What tension must be used to obtain the standing wave shown below? L=0.930 m = 0.465 m; v = f and T = v2 , thus T = (0.465 m)2 (120 Hz)2 (1.30 x 10-3 kg/m) = 4.05 N (thus m =T/g = 0.413 kg) Phys 123A Exam II May 9, 2008 ...
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