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SMDEP Physics

SMDEP Physics. Waves, Superposition, Standing Waves Webpage updated: http://www.astro.yale.edu/krines/smdep. Quiz Results. Pre-quiz and Post-quiz to measure change Pre-quiz mean: 8.6 (max:24) Post-quiz mean: 15.7 (max:29)

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SMDEP Physics

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  1. SMDEP Physics Waves, Superposition, Standing Waves Webpage updated: http://www.astro.yale.edu/krines/smdep

  2. Quiz Results • Pre-quiz and Post-quiz to measure change • Pre-quiz mean: 8.6 (max:24) • Post-quiz mean: 15.7 (max:29) • This change is larger than most semester-long, lecture-based courses • You all did it in 11 days! • Office Hours M, Tu 5-7 pm • Answer sheets available, blank quiz for inspection

  3. 0 of 5 10 Ch 15, #31(a): ratio v2/v1 of speeds of waves • (m1/m2)1/2 • (m2/m1)1/2 • m2/m1 • m1/m2 • Other • Didn’t finish

  4. 0 of 5 10 Ch 15, #31(b): ratio of wavelengths (string 2 to string 1) • (m1/m2)1/2 • (m2/m1)1/2 • m2/m1 • m1/m2 • Other • Didn’t finish

  5. 10 0 of 5 Ch 15, #36: violin frequency? • 294 Hz • 74 Hz • 221 Hz • 392 Hz • Other • Didn’t finish

  6. 0 of 5 10 Ch 15, #44 abc: mass for 1/2/5 loops? • (1.38, 0.35, 0.055) kg • (2.76, 0.7, 0.1) kg • (0.38, 0.09, 0.011) kg • (1.38, 5.5, 35) kg • Other • Didn’t finish

  7. 10 0 of 70 Consider a wave, described by y=ymsin(kx+t). What is the motion of a particular location (a particular x value) along the string? • Back and forth in the +/- x direction • Back and forth in the +/- y direction • Back and forth in the +/- z direction • Cannot tell without more information

  8. 10 0 of 70 Consider the same wave, described by y=ymsin(kx+t). What is the shape of the wave? • Sine function • Sine function plus linear term • Cannot tell without more information

  9. 10 0 of 70 Consider the same wave, described by y=ymsin(kx+t). What is the velocity of propagation of the wave? • /k • k/ • dym/dt • Cannot tell without knowing the properties of the string

  10. 10 0 of 70 Consider the same wave, described by y=ymsin(kx+t). What direction is the wave traveling? • In the +x direction • In the –x direction • In the +y direction • In the –y direction • Cannot tell without knowing the properties of the string

  11. 10 0 of 70 Consider the sum of two identical waves (same amplitude, wavelength, frequency, phase, propagation direction). What is the amplitude of the sum? • Same as either wave • Twice the amplitude of either wave • Half the amplitude of either wave • Zero • None of the above

  12. 10 0 of 70 Consider the sum of two similar waves (same amplitude, wavelength, frequency, propagation direction), but with phase different by p radians. What is the amplitude of the sum? • Same as either wave • Twice the amplitude of either wave • Half the amplitude of either wave • Zero • None of the above

  13. 10 0 of 70 Consider the sum of two similar waves (same amplitude, wavelength, frequency, propagation direction), but with phase different by 2p radians. What is the amplitude of the sum? • Same as either wave • Twice the amplitude of either wave • Half the amplitude of either wave • Zero • None of the above

  14. 10 0 of 70 Consider the sum of two similar waves (same amplitude, wavelength, frequency, propagation direction), but with phase different by p/2 radians. What is the amplitude of the sum? • Same as either wave • Twice the amplitude of either wave • Half the amplitude of either wave • Zero • None of the above

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