P1F REVISION NOTES

SINGLE SCIENCE, OCR BOARD - HIGHER TIER, PHYSICS - P1F

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Wireless Signals
Wireless signals uses electromagnetic radiation, to
transmit signals e.g. Wi ­ Fi, Laptops, Sat Nav, Mobile
Phones, Remote Controls and IPods
The advantage of this technology is that they :
Are portable
Can be used anywhere
Available 24 / 7
Most communication is by microwaves and radio waves

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Communications can be affected
Diffraction ­ where the waves spread out resulting in signal loss
Refraction ­ Where different densities / layers in the
atmosphere cause changes in direction
Interference ­ Where radio stations transmitters transmit on
different frequencies
Distance ­ Each transmitter along the the route causes
reduction
in signal so amplifiers have to be used…read more

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How satellites work…read more

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