EM waves for communication (Edexcel GCSE Physics): Flashcards
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Radio waves in EM spectrum: wavelength and frequency
Radio waves in EM spectrum: wavelength and frequency
Longest wavelength, lowest frequency
What happens when conductor absorbs radio waves?
What happens when conductor absorbs radio waves?
Induces AC at same frequency as incoming waves
How are radio waves produced?
How are radio waves produced?
By oscillations in electrical circuits
Device where electrons oscillate to produce radio waves
Device where electrons oscillate to produce radio waves
Transmitter
Long wave radio wavelength range
Long wave radio wavelength range
1-10 km
Why can long wave radio be received halfway around world?
Why can long wave radio be received halfway around world?
Bends around curved surface of Earth
Short wave radio wavelength range
Short wave radio wavelength range
10-100 metres
How do short wave radio signals travel long distances?
How do short wave radio signals travel long distances?
Reflected by Earth's atmosphere
Type of waves Bluetooth uses
Type of waves Bluetooth uses
Short-wave radio waves
Requirement for clear TV & FM signal reception
Requirement for clear TV & FM signal reception
Direct line of sight with transmitter
Why are microwaves/radio waves used for satellite comms?
Why are microwaves/radio waves used for satellite comms?
Pass through Earth's atmosphere easily
Main uses of radio waves
Main uses of radio waves
Communication and broadcasting