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# Telecomunication

what is the speed of sound through air? 340m/s
What is the speed of light through air? 3,000,000,000
give an example where light and sound can be seen and heard at different moments. when lightning flashes
give the formula for measuring the speed of an object when you have the distance and the time. S=D/T
what is the amplitude of a wave? the size of maximum disturbance from the center position.
What is the crest? It is the peak point of the amplitude
Explain what the wave length is. It is the distance from one point on a wave to the next point on the next wave.
What is meant by the frequency? the number of waves passing a point in one second.
Define the wave speed. Distance traveled by a wave in one second.
How do you find the frequency of a wave if you are given the wave length and the speed? F=v/lamda
What is a transmitter? a tool hat sends out signals
Name the purpose of a receiver. it receives signals.
what is the angle of incidence? the angle of the light signal by the normal.
Name 3 advantages of optical fibers. Cheaper, smaller, lighter, greater signal capacity, higher signal quality, ect not faster!
How do optical fibers work? why? they work by using total internal reflection. this means that the angle of incidence is large meaning it reflects along the fiber without penetrating the fiber and escaping.
list the main components of a receiver. Aerial, tuner, decoder, amplifier loudspeaker.
What is an amplitude modulated wave (AM)? it is used as a signal and is a combination of a carrier wave and an audio signal.
Explain how a picture tube works. The picture tube contains an electron gun which fires electrons at a phosphor coated screen. the electron gun fires electrons at the screen where the kinetic energy of the electrons is turned into a spot of light.
Created by: AndyMac225

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