Syllabus Dot Points Year 11 Prelim Hsc

Syllabus Dot Points Year 11 Prelim Hsc

Analyse information to identify the waves involved in the transfer of energy that occurs during the use of a Mobile Phone.
Analyse: Identify components and the relationship among them; draw out and relate implications.

A mobile phone is a device which allows two people to communicate with each other almost anywhere where they are. A mobile phone works by transforming energies and mainly the use of waves.
The function and science of mobile phones relates heavily in the use of waves. Mobile phones are known as full duplex devices, this means that a phone uses one frequency to deliver sound and another to receive sound and so both sides of the telephone can talk simultaneously.
The Mobile phone as also often referred to as cell phone, this is due to the fact of the positioning and area of the base stations, these are stations which receives the electrical energies (discussed further next paragraph) and transfer them to the other end of the mobile phone. These base stations can only do this in hexagonal cells shown below. Each base station is connected to switching centres by cable network that either connects to another base station or another switching centre or a fixed telephone system (e.g. home phones).

The processes of the transformation of energies in mobile phones can be seen in a simple call.
A mobile phone has a built in microphone that changes sound waves into electrical signals. This is the first energy transfer from sound into electrical energy. This electrical signals is then digitised into binary codes and is transmitted from the phone into base stations in the form of radio waves. From the base station, depending on what the mobile phone is connected to, 3 different path can be taken, First when a distant fixed telephone is called, the electrical energy is transferred into light and travel along an optical fibre network and then reaches a switching centre nearest to the fixed telephone system and then the light is transformed into electrical...