23_InstSolManual_PDF_Part1

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

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Unformatted text preview: ELECTROMAGNETIC WAVES 23 7. A 8. B 9. C 10. A, B 11. B 12. D 13. B 14. C. 15. D Answers to Multiple-Choice Problems 1. D 2. E 3. A, B, E 4. D 5. C 6. C Solutions to Problems 23.1. Set Up: The distance of the earth from the sun is the orbital radius of the earth, r 5 1.50 3 1011 m. The speed of light is c 5 3.00 3 108 m / s. x 1.50 3 1011 m Solve: t 5 5 5 500 s 5 8.33 min c 3.00 3 108 m / s 23.2. Set Up: The speed of electromagnetic waves in air is c 5 3.00 3 108 m / s. Solve: A total time difference of 0.60 ms corresponds to a difference in distance of cD t 5 1 3.00 3 108 m / s 2 1 0.60 3 1026 s 2 5 180 m. 3.84 3 108 m d 5 5 1.28 s c 3.00 3 108 m / s (b) d 5 ct 5 1 3.00 3 108 m / s 2 1 8.61 yr 2 1 3.156 3 107 s / yr 2 5 8.15 3 1016 m 5 8.15 3 1013 km Reflect: The speed of light is very large, but it can still take light a long time to travel enormous astronomical distances. Solve: (a) t 5 23.3. Set Up: The speed of light in vacuum is c 5 3.00 3 108 m / s. d 5 ct. 1 yr 5 3.156 3 107 s. 23.4. Set Up: E 5 cB. The magnetic field of the earth is about 1024 T. Solve: B 5 3.85 3 1023 V / m E 5 1.28 3 10211 T. The field is much smaller than the earth’s field. 5 c 3.00 3 108 m / s 3.00 3 108 m / s c 5 5 6.0 3 104 Hz l 5.0 3 103 m 3.00 3 108 m / s 5 6.0 3 1013 Hz (ii) f 5 5.0 3 1026 m 3.00 3 108 m / s c (iii) f 5 5 5 6.0 3 1016 Hz l 5.0 3 1029 m 3.00 3 108 m / s c (b) (i) l 5 5 5 4.62 3 10214 m 5 4.62 3 1025 nm f 6.50 3 1021 Hz 3.00 3 108 m / s (ii) l 5 5 508 m 5 5.08 3 1011 nm 590 3 103 Hz Solve: (a) (i) f 5 23.5. Set Up: The wave speed is c 5 3.00 3 108 m / s. c 5 fl. 23-1 ...
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.

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