Aiming for Grade 8 LOs: emphasis on the position of microwaves within it. Link this to 6.2.4 Electromagnetic waves have many the rate at which data can be transmitted microwaves – Describe in detail how carrier waves are practical applications. For example: provide the greatest rate. Discuss the transmission of used in the transfer of information. radio waves television and radio signals, particularly the need for • – Describe the structure of a microwaves satellite communications, transmission towers the phones do not communicate • – – communication system, including the cooking food directly. An older, broken phone may be useful here to show effect of a radio wave on the current in the visible light fi bre optic communications. the aerial. No link between mobile phone use and brain • – receiver. effects has so far been found the intensity of the signals – Discuss the relationship between wavelength, are very low and are unlikely to cause damage. Students data transmission, and to then complete the Bump up your grade worksheet to explain why particular frequencies are chosen consolidate their understanding of the electromagnetic for particular transmissions. spectrum and how microwaves and radio waves are used in communication. Optical fibres for communication (20 min) Demonstrate a simple transition of light pulsed through a fibre with a torch and convoluted path for the cable. Remind students that visible light and IR are much higher frequency than radio and so fibres will transmit data at a higher rate. Students can compare energy and information transfer through a fibre to that in radio transmissions. Higher-tier students also need to discuss signals and carrier The process here is quite complex and students need to be led through the stages carefully. Plenaries (5 min) Give the students a diagram of an Round the bend
6.2.4 Electromagnetic waves have many practical applications. For example: • radio waves – television and radio • microwaves – satellite communications, cooking food • visible light – fi bre optic communications. emphasis on the position of microwaves within it. Link this to the rate at which data can be transmitted – microwaves provide the greatest rate. Discuss the transmission of signals, particularly the need for transmission towers – the phones do not communicate directly. An older, broken phone may be useful here to show the aerial. No link between mobile phone use and brain effects has so far been found – the intensity of the signals are very low and are unlikely to cause damage. Students then complete the Bump up your grade worksheet to consolidate their understanding of the electromagnetic spectrum and how microwaves and radio waves are used in communication. Optical fibres for communication (20 min) Demonstrate a simple transition of light pulsed through a fibre with a torch and convoluted path for the cable. Remind students that visible light and IR are much higher frequency than radio and so fibres will transmit data at a higher rate. Students can compare energy and information transfer through a fibre to that in radio transmissions. Higher-tier students also need to discuss signals and carrier The process here is quite complex and students need to be led through the stages carefully. Plenaries Round the bend (5 min) Give the students a diagram of an Aiming for Grade 8 LOs: Describe in detail how carrier waves are used in the transfer of information. Describe the structure of a communication system, including the effect of a radio wave on the current in the receiver. Discuss the relationship between wavelength, data transmission, and to explain why particular frequencies are chosen for particular transmissions.
oxo_AQA16_P13uu_sw01_xxaann.docx