26_InstSolManual_PDF_Part1

26_InstSolManual_PDF_Part1 - INTERFERENCE AND DIFFRACTION...

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26-1 I NTERFERENCE AND D IFFRACTION 26 Answers to Multiple-Choice Problems 1. C 2. A, C, D 3. B 4. C 5. A 6. A 7. B 8. A 9. C 10. B 11. A 12. B 13. D 14. C 15. C Solutions to Problems 26.1. Set Up: Constructive interference occurs for Destructive interference occurs for For this problem, and The path taken by the person ensures that x is in the range Solve: (a) For 1, 2, 3, 4 the values of x are 150 cm, 116 cm, 82 cm, 48 cm, 14 cm. (b) For 1, 2, 3 the values of x are 133 cm, 99 cm, 65 cm, 31 cm. Reflect: When the path difference is which is one wavelength. When the path difference is 17 cm, which is one-half wavelength. 26.2. Set Up: For radio waves, Constructive interference occurs for Destructive interference occurs for For this problem, and The path taken by the person ensures that x is greater than 50.0 m. Solve: (a) For 1, 2, 3, 4, 53.3 m, 56.5 m, 59.8 m, 63.0 cm. (b) For 1, 2, 3, 4, 54.9 m, 58.2 m, 61.4 m, 64.7 m. 26.3. Set Up: The nature of the interference depends on the path difference. Solve: (a) The person is a distance from A and a distance from B . The path difference is
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