Electromagnetic waves

Содержание и основные понятия

This chapter links observed phenomena, physical models, and mathematical laws, first form a qualitative picture, then explore the relationships in interactive models.
GEF · 11 grade
PIF · Baseline
theory + model
28
Chapter Pages
Three meaningful routes: concepts, laws, and model research.
28.1
Electromagnetic wave radiation
Open rolling contour
28.2
Electromagnetic spectrum
From radio wave to gamma radiation
28.3
Radio communications
Modulization, transmission and reception
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Study route
28.1. Electromagnetic wave radiation
- Rapidly moving charges create a variable electromagnetic field that can separate itself from the source, and the antenna converts the high frequency current into wave and back.
28.2. Electromagnetic spectrum
- The spectrum ranges differ in frequency, wave length, and the nature of the interaction with the substance: boundaries are conditional, and physical nature is uniform.
28.3 Radio communications
The low frequency information signal is transferred to a high frequency amplitude change, frequency, or phase. The receiver selects the right channel and restores the data.
Basis of contents:
The federal work programme on physics, the GEF OSL/GS and the thematic sequence of popular school lines are written specifically for Alterna and does not reproduce textbooks.