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Question :
a) Describe the following modes of wave propagation:
- Line of sight - Ground waves - Skywaves
b) Why can waves with a very low frequency be used for submarine communication? Give one reason why are they not used for data transmission in mobile phones and computer networks.
c) A Line-of-sight (LOS) is usually required between a sender and receiver for radio waves with frequency > 30 MHz, nevertheless, mobile phones can work in big cities without such LOS. Explain.
d) Spread spectrum is a technique which generates signals which are strong and loud, that is resistant to interference. Explain how this is achieved.
e) Briefly explain how directional and omni-direction antennas work. Is a directional antenna suitable for mobile phone communication?
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What are the factors determine the control signals? Contents of the control step counter Contents of the instruction register Contents of the condition code flag
Question: a) Consider a car having a collision detection mechanism. Write an algorithm (in simple English) to illustrate the collision detection mechanism. b) The same car
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