Flashcards
physics p1f
Cards in this deck (8)
- 1give three uses of infrared waves other than cooking and communicationsremote controls
burgular alarms
data links between technology - 2describe an analogue signalcontinuously varying signal
- 3what are optical fibres used to transmit?telephone conversations and computer data
- 4why do optical fibres have a reflective coating around them?increase total internal reflection
- 5describe a digital signal2 states: on/off
1011101011- binary code - 6what are the advantages of digital signals over analogue signals?>maintain their quality better as they transfer
- analogue signals produce 'noise' which is random extra info added to the signal - 7why have we switched to digital for our TV and radio signals?so we have a better quality picture and sound because we avoid 'noise'
- 8what does multiplexing mean?being able to send lots of signals at the same time, through an optical fibre
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- Flashcards on physics p1f, created by parkermolly20 on 06/06/2015.
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- parkermolly20
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