23_InstSolManual_PDF_Part1

23_InstSolManual_PDF_Part1 - ELECTROMAGNETIC WAVES 23 7 A 8...

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23-1 E LECTROMAGNETIC W AVES 23 Answers to Multiple-Choice Problems 1. D 2. E 3. A, B, E 4. D 5. C 6. C 7. A 8. B 9. C 10. A, B 11. B 12. D 13. B 14. C. 15. D Solutions to Problems 23.1. Set Up: The distance of the earth from the sun is the orbital radius of the earth, The speed of light is Solve: 23.2. Set Up: The speed of electromagnetic waves in air is Solve: A total time difference of corresponds to a difference in distance of 23.3. Set Up: The speed of light in vacuum is Solve: (a) (b) Reflect: The speed of light is very large, but it can still take light a long time to travel enormous astronomical distances. 23.4. Set Up: The magnetic field of the earth is about Solve: The field is much smaller than the earth’s field. 23.5. Set Up: The wave speed is Solve: (a) (i) (ii) (iii) (b) (i) (ii) l 5 3.00 3 10 8 m / s 590 3 10 3 Hz 5 508 m 5 5.08 3 10 11 nm l 5 c f 5 3.00 3 10 8 m / s 6.50 3 10 21 Hz 5 4.62
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