C2 Flashcards
Which two features of an analogue wave vary continuously?
frequency and amplitude
What type of signal is continuously variable and can have any value?
analogue
What type of signal has two binary states, ON (1) or OFF (0) and no values in between?
Digital
Give an advantage of analogue signals
Low bandwidth
Which type of signal can be regenerated?
Digital
Which type of signal has better overall quality?
Digital
Which type of signal can travel longer distances?
Digital
Name the process involved in converting analogue to digital signals
sampling data
What term describes the process of sending different wavelengths of light down the same individual optical fibre?
Multiplexing
Broadband can be transmitted with analogue or digital signals or both?
both
Why are radiowaves preferred for mobile phone communication?
It has longer wavelengths and can travel much further distances
What is a disadvantage of using radiowaves in mobile phone trasmissions?
Radiowaves cannot pass through the ionosphere in the Earth’s atmosphere
Why are radio/microwaves preferred over other waves for use in Wi-fi signal transmission?
They have longer wavelengths so the signals can pass through walls
Why would UV light not be used in mobile phone communications?
The waves cannot pass through solid objects because they do not have long enough wavelengths
Why are shorter wavelength microwaves preferred over radiowaves in satellite communications communication devices
They can still travel long distances but can also pass through the ionosphere in the Earth’s atmosphere
