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Gelombang Elektromagnetik

Gelombang Elektromagnetik. Kelompok 6 Nurlia Enda Hariza Ni Made Mahas. Sifat-sifat gelombang elektromagnetik. Gelombang elektromagnetik dapat merambat dalam ruang tanpa medium merupakan gelombang transversal

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Gelombang Elektromagnetik

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  1. Gelombang Elektromagnetik Kelompok 6 Nurlia Enda Hariza Ni Made Mahas Group 6 Nurlia,Ni Made,Hariza

  2. Sifat-sifatgelombangelektromagnetik • Gelombangelektromagnetikdapatmerambatdalamruangtanpa medium • merupakangelombang transversal • tidakmemilikimuatanlistriksehinggabergeraklurusdalammedan magnet maupunmedanlistrik • dapatmengalamipemantulan (refleksi), pembiasan (refraksi), perpaduan (interferensi), pelenturan (difraksi), pengutuban (polarisasi) • Perubahanmedanlistrikdanmedan magnet terjadisecarabersamaan, sehinggamedanlistrikdanmedan magnet sefasedanberbandinglurus

  3. y y x x z Electric Field z Magnetic Field y y y y y y y y y y x x x x y y y z z z z Electric Field Electric Field Electric Field Electric Field x x x z z z Electric Field Electric Field Electric Field x x x x x x z z z Electric Field Electric Field Electric Field z z z Electric Field Electric Field Electric Field Magnetic Field Magnetic Field Magnetic Field Magnetic Field Magnetic Field Magnetic Field Long waves = low frequency, low energy Short waves = high frequency and high energy

  4. Sketsagelombangelektromagnetik

  5. 1. SpektrumElektromagnetik • Gel. Radio • Gel. Mikro • Gel. Inframerah • Cahayatampak • Gel. UV • Sinar-X • Sinar Gamma Group 6 Nurlia,Ni Made,Hariza

  6. Electromagnetic Spectrum • Gamma rays • X-ray • Gel. UV • Visible light • Infrared Wave • Micro Wave • Radio Wave Group 6 Nurlia,Ni Made,Hariza

  7. SpektrumElektromagnetik Gel. Radio : Panjang gel. lebihbesardari 1 m Gel. Mikro : Panjang gel. antara 1 mm sampai 1 m Gel. Inframerah : Panjang gel. 700 nm sampai 1000 nm (Radiasitermal) suhu 3 K – 3000 K  atom/mol berubahenergidalam (vibrasidanrotasinya) Cahayatampak : Panjang gel. 400 nm – 700 nm, atom transisidarienergitinggikerendah. Gel. UV : Panjang gel. 1 nm-400 nm, transisielektronterluarataudaritermalmataharidgnsuhu > 6000 K Sinar-X : Panjang gel. 0,01 nm-10nm, transisielektron yang lebihdalamataupartikeldiperlambat Sinar Gamma : Panjang gel < 10pm, transisiinti atom ataupeluruhanradioaktif

  8. SPEKTRUM GELOMBANG ELEKTROMAGNETIK

  9. 2. Energidalam GEM Hubunganantarakuatmedanlistrik dg medanmagnetik : Dimana : Dengan : Em, Bm = nilai max amplitudomedanlistrikdanmagnetik c = cepatrambatcahaya Group 6 Nurlia,Ni Made,Hariza

  10. 2.Energy in the GEM The relationship between the electric field strength magnetic field with Where : With : • E m, B m = max value of the amplitude of the electric and magnetic fields • c = speed of propagation of light s Group 6 Nurlia,Ni Made,Hariza

  11. 3. RapatEnergiListrikdanMagnetik Rapatenergilistrikdanmagnetikdinyatakandengan : Dengan : ue = rapatenergilistrik (J/m3) ε0 = 8,85 x 10-12 C2 N-1m-2 E = kuatmedanlistrik (N/C) uB = rapatenergimagnetik (J/m3) B = besarinduksimagnetik (Wb/m2) μ0 = 4π x 10-7Wb/A Group 6 Nurlia,Ni Made,Hariza

  12. 3.Meeting Electrical and Magnetic Energy Meetings electrical and magnetic energy is given by: By: • u e = meeting electrical energy (J / m 3) • ε 0 = 8.85 x 10 -12 C 2 N -1 m -2 • E = electric field strength (N / C) • u B = meetings magnetic energy (J / m 3) • B = large magnetic induction (Wb / m 2) • μ 0 = 4π x 10 -7Wb / A Group 6 Nurlia,Ni Made,Hariza

  13. 4. Intensitas GEM Intensitas GEM ataulajuenergiygdipindahkanmelalui GEM disebutpointing (S). Denganintensitas rata-rata : Group 6 Nurlia,Ni Made,Hariza

  14. 4.GEMIntensity GEM intensity or rate of energy transferred through the GEM reply is pointing (S). With an average intensity: Group 6 Nurlia,Ni Made,Hariza

  15. HubunganIntensitasGelombangdenganEnergi Rata-rata Denganmenggunakanhubungandan rapatenergimagnetikadalah Rapatenergi total adalah Group 6 Nurlia,Ni Made,Hariza

  16. Wave intensity relationship with average energy With use relationship and meeting of magnetic energy is • Meeting of the total energy is Group 6 Nurlia,Ni Made,Hariza

  17. Rapatenergi total rata-rata adalah Intensitasgelombang (lajuenergi rata2 per m2) ygdipindahkanmelalui GEM sama dg rapatenrgi rata2 dikalikandengancepatrambatcahaya. Dengan : I = intensitasradiasi (W/m2) S = intensitasgelombang = lajuenergi rata2 per m2 (W/m2) P = dayaradiasi (W) A = luaspermukaan (m2) Group 6 Nurlia,Ni Made,Hariza

  18. Meeting of the total energy is the average The intensity of the wave (rata2 energy rate per m 2)yg moved through the same GEM meeting enrgi dg rata2 vines multiplied rapidly light. By: • I = intensity of radiation (W / m 2) • S = the intensity of the wave = rate of energy rata2 per m 2 (W / m 2) • P = power radiation (W) • A = surface area (m 2) Group 6 Nurlia,Ni Made,Hariza

  19. y1 = A sin 2pnt y2 = A sin 2pnt - 90 0 Field Strength (y) 2p 5p p p 3p 2 2 2 y = electrical or magnetic field strength A = amplitude n = frequency t = time f = phase angle (0° - 360° or 0 - 2π radians) y = A sin (2pnt + f) Gelombangelektromagnetikadalah fungsi sinus, bersifataditif. 2 gelombang dengan Df = 90° or p/2

  20. Kecepatangelombangelektromagnetiksamadengankecepatancahaya yang dirumuskan : o = 8.85 x 10-12 C2/Nm2 o = 12.56 x 10-7 wb/amp.m C = 3 . 108 m/s o = permitivitas ruang hampa o = perbeabilitas ruang hampa C = cepat rambat cahaya

  21. Cepatrambatgelombangelektromagnetikdinyatakandenganpanjanggelombangdanfrekwensi : c = .f c = cepatrambatgelombangelektromagnetik (3.108 m/s)  = panjanggelombang (m) f = frekwensi (Hz)

  22. + Wavelength (l) Amplitude (A) 0 Electric Field - Time or Distance Arie BS Parameter Gelombang Periode (p) – waktu yg diperlukan untuk oleh satu gelombang. Frequency (n) – jumlah gelombang tiap detik. n= 1/p ( s-1 = Hz ) Amplitude (A) – tinggi gelombang maksimum. Wavelength (l) – jarak antara 2 titik identik dalam satu gelombang.

  23. Sumbersumber yang sangatmembantuberhasilnyapresentasiini • http://basicsphysics.blogspot.com/2009/03/gelombang-elektromagnetik.html • http://id.wikipedia.org/wiki/Radiasi_elektromagnetik • http://www.scribd.com/doc/7578702/Gelombang-Elektromagnetik-Terbentuk-Oleh-Getaranpaetikel-Medium-Yang-Merambatnya • http://www.tofi.or.id/download_file/Kul_13_3.ppt • http://basicsphysics.blogspot.com/2009/03/gelombang-elektromagnetik.html • http://id.wikipedia.org/wiki/Radiasi_elektromagnetik • http://www.scribd.com/doc/7578702/Gelombang-Elektsromagnetik-Terbentuk-Oleh-Getaranpaetikel-Medium-Yang-Merambatnya

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