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18คลื่นแม่เหล็กไฟฟ้า

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18คลื่นแม่เหล็กไฟฟ้า

  1. 1. SchoolDD.com18 www.schoolDD.com
  2. 2. 18 F F F F F F F 18.1 F F F FF 1. F ( E) F F ( B) 2. F F ( B) F ( E) 3. F 4. F F F F F F YZ F X F F F - F F - F F F F F - F F (3 x 108 m/s) 18.2 F R S A B G D F F F F www.schoolDD.com 1
  3. 3. F F F F F F F A F F B F F F F F F F B B F A F F G F F F F F G spark F F F F F G F F F D F F D F F spark F F D F G18.3 F F i AC v F F F F F F F F F F F- F F F F18.3 F F F F F F F F F F F F F F 3.0 x 108 m/s F F F F F (Hz) 0 10 102 103 104 105 106 107 108 109 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 F F F www.schoolDD.com 2
  4. 4. 18.3.1 F F F 106 109 F F F F F (modulate) F2 AM ( Amplitude Modulation) F F AM F F ( F ) F F F- F AM F F- AM F 530 - 1600 F F F F F F- F F F AM FM ( Frequency Modulation) F F FM F F- F FM F- FM F 88 - 108 F F F www.schoolDD.com 3
  5. 5. F F AM F2 F FM F F F FM F F F F F F FM F F F18.3.2 F F F 108 F F F FM F F F F F F F F F F 80 F F F F F F F F F F F F F F F F F www.schoolDD.com 4
  6. 6. 18.3.3 F F F 109 1011 F F F F F F F F F F F F F18.3.4 F F F 1011 1014 F F F F F F F F F F F F F F F F F F18.3.5 F 4 x 1014 8 x 1014 F400 700 F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F F18.3.6 F( LASER) F F F F F F F F F F F 1. F F F F F , DVD 2. F F F F 3. F (holography) 4. 5. F F 6. F 7. 8. 9. 10. F F F www.schoolDD.com 5
  7. 7. 18.6.7 ( F ) F F F F 1015 1018 F F F F F F F F F F F F F F F F F F F18.6.8 F F F F 1017 1021 F F F F F F F F F F F F F F F F FF18.6.9 F F F F F F F18.7 F F F F F F F F F F F F F F Y E Z X E F F F F www.schoolDD.com 6
  8. 8. 18.7.1 Y Z. F . F F Y Z F F F F F F F F F F . F F F FF F F F F F F (Polarization) 1. F F F F F. F FF F F F F . F F F F F F F F . F F FF F F1 F F F F F F F F 2. F F F F F F F F F F F F www.schoolDD.com 7
  9. 9. B 90° 2 F F F F F F F F F F F FF F F B F F 90° F F F F F F F F (polarizing angle) F F F n 1 F n1 sin 1 = n2 sin 2 ( ) 1= B , 2 = 90 = 90 B , = B ( = F ) F F 1 sin B = n sin (90 B) sin B = n cos B tan B = n -1 B = tan n F F F B = tan-1 n F F F 1 F F 100.0 F F F F F 3x 10 8 m/s v=f = = = 3.0 m Ans F F www.schoolDD.com 8
  10. 10. F 2 F F F 48° F F F F n1 = 1 48° 48° 42° n2 = ?F F n1 sin 1 = n2 sin 2 1 sin 48 = n2 sin 42 = n2 n2 = = tan 48 = 1.11 Ans F F F F F 3 F F F 37° n1 = 1 c = 48° n2 = ? n1 sin 1 = n2 sin 2 n1 sin c = n2 sin 90 1 sin 37 = n2 (1.0) n2 = sin 37 = = 0.6 F F www.schoolDD.com 9
  11. 11. F n1 = 1 B=? B B 90 - B n2 = 0.6 n1 sin 1 =n2 sin 2 n1 sin B = n2 sin (90 - B) 1 sin B = n2 cos B n2 = tan B 0.6 = tan B -1 B = tan 0.6 = 30.96° Ans“ 1 .... ” F F www.schoolDD.com 10

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