Gelombang éléktromagnétik: Béda antarrépisi
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Baris ka-43:
dimana ''v'' nyaéta laju gelombang (''[[laju cahaya|c]]'' dina jero rohangan hapa, atawa kurang ti c lamun dina jero médiyeum lianna), ''f'' nyaéta frékuénsi sarta λ nyaéta panjang gelombang. Mangsa gelombang meuntasan wates-wates antara médiyeum anu béda, laju cahayana robah tapi frékuénsina tetap konstan.
[[Interférensi]] nyaéta superposisi (tumpang tindih) antara dua atawa leuwih gelombang anu ngahasilekun hiji pola gelombang anu anyar.
Énergi gelombang éléktromagnétik témpo-témpo disebut [[énergi radiasi]].
Baris ka-60:
=== Laju rambatan ===
{{tarjamahkeun|Inggris}}
Any electric charge which accelerates, or any changing magnetic field, produces electromagnetic radiation. Electromagnetic information about the charge travels at the speed of light. Accurate treatment thus incorporates a concept known as [[retarded time]] (as opposed to advanced time, which is unphysical in light of [[causality]]), which adds to the expressions for the electrodynamic [[electric field]] and [[magnetic field]]. These extra terms are responsible for electromagnetic radiation. When any wire (or other conducting object such as an [[antenna (electronics)|antenna]]) conducts [[alternating current]], electromagnetic radiation is propagated at the same frequency as the electric current. Depending on the circumstances, it may behave as a [[wave]] or as [[photon|particles]]. As a wave, it is characterized by a velocity (the [[speed of light]]), [[wavelength]], and [[frequency]]. When considered as particles, they are known as [[photon]]s, and each has an energy related to the frequency of the wave given by [[Max Planck|Planck's]] relation ''E = hν'', where ''E'' is the energy of the photon, ''h'' = 6.626 × 10<sup>
One rule is always obeyed regardless of the circumstances: EM radiation in a vacuum always travels at the [[speed of light]], ''relative to the observer'', regardless of the observer's velocity. (This observation led to [[Albert Einstein]]'s development of the theory of [[special relativity]].)
Baris ka-96:
=== Cahaya ===
{{
Gelombang ÉM dina panjang gelombang antara kira-kira 400 [[nanométer|nm]] jeung 700
[[Serat optik]] ngarambatkeun cahaya anu bisa ditumpangan data sora atawa gambar. Prosésna sarupa jeung anu digunakeun dina ngarambatkeun gelombang radio.
=== Gelombang radio ===
{{
Gelombang radio bisa dimangfaatkeun pikeun mawa informasi kucara ngarobah-robah [[amplitudo]], [[frékuénsi]] jeung [[fase]] dina sahiji [[pita frékuénsi]].
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