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Chapter 35

Chapter 35. Interference (not given– computer problems). Figure 35.1 at the right shows a “snapshot” of sinusoidal waves spreading out in all directions from a source.

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Chapter 35

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  1. Chapter 35 Interference (not given– computer problems)

  2. Figure 35.1 at the right shows a “snapshot” of sinusoidal waves spreading out in all directions from a source. • Superposition principle:When two or more waves overlap, the resultant displacement at any instant is the sum of the displacements of each of the individual waves. Wave fronts from a disturbance

  3. Figure 35.2 at the right shows two coherent wave sources. • Constructiveinterference occurs when the path difference is an integral number of wavelengths. • Destructive interference occurs when the path difference is a half-integral number of wavelengths. Last Time – constructive/destructive interference

  4. Q35.1 Two sources S1 and S2 oscillating in phase emit sinusoidal waves. Point P is 7.3 wavelengths from source S1 and 4.3 wavelengths from source S2. As a result, at point P there is A. constructive interference. B. destructive interference. C. neither constructive nor destructive interference. D. not enough information given to decide

  5. A35.1 Two sources S1 and S2 oscillating in phase emit sinusoidal waves. Point P is 7.3 wavelengths from source S1 and 4.3 wavelengths from source S2. As a result, at point P there is A. constructive interference. B. destructive interference. C. neither constructive nor destructive interference. D. not enough information given to decide

  6. Q35.2 Two sources S1 and S2 oscillating in phase emit sinusoidal waves. Point P is 7.3 wavelengths from source S1 and 4.6 wavelengths from source S2. As a result, at point P there is A. constructive interference. B. destructive interference. C. neither constructive nor destructive interference. D. not enough information given to decide

  7. A35.2 Two sources S1 and S2 oscillating in phase emit sinusoidal waves. Point P is 7.3 wavelengths from source S1 and 4.6 wavelengths from source S2. As a result, at point P there is A. constructive interference. B. destructive interference. C. neither constructive nor destructive interference. D. not enough information given to decide

  8. Figure 35.5 below shows Young’s double-slit experiment with geometric analysis. Two-source interference of light

  9. Follow the text discussion of two-slit interference. • Figure 35.6 at the right is a photograph of the interference fringes from a two-slit experiment. Interference from two slits

  10. Q35.3 In Young’s experiment, coherent light passing through two slits (S1 and S2) produces a pattern of dark and bright areas on a distant screen. If the wavelength of the light is increased, how does the pattern change? A. The bright areas move closer together. B. The bright areas move farther apart. C. The spacing between bright areas remains the same, but the color changes. D. any of the above, depending on circumstances E. none of the above

  11. A35.3 In Young’s experiment, coherent light passing through two slits (S1 and S2) produces a pattern of dark and bright areas on a distant screen. If the wavelength of the light is increased, how does the pattern change? A. The bright areas move closer together. B. The bright areas move farther apart. C. The spacing between bright areas remains the same, but the color changes. D. any of the above, depending on circumstances E. none of the above

  12. Q35.4 In Young’s experiment, coherent light passing through two slits (S1 and S2) produces a pattern of dark and bright areas on a distant screen. What is the difference between the distance from S1 to the m = +3 bright area and the distance from S2 to them = +3 bright area? A. three wavelengths B. three half-wavelengths C. three quarter-wavelengths D. not enough information given to decide

  13. A35.4 In Young’s experiment, coherent light passing through two slits (S1 and S2) produces a pattern of dark and bright areas on a distant screen. What is the difference between the distance from S1 to the m = +3 bright area and the distance from S2 to them = +3 bright area? A. three wavelengths B. three half-wavelengths C. three quarter-wavelengths D. not enough information given to decide

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