In this unit we build on work we have done before on light . We will consider the electromagnetic spectrum in terms of different regions related to wavelength and learn how to use the wave equation to link wavelength, frequency and energy carried by a wave.

Properties and uses of the regions of the electromagnetic spectrum will be considered and we will investigate the relationship between surface colour, temperature, and the rate of emission of infra-red radiation. You need to be able to describe the use of radio waves in communications for television and mobile phones along with outlining transmissions of signals through optical fibres. Higher tier students also need to understand the process of modulation of carrier waves to give a more complex picture of how information can be transmitted using waves.

Task 2c: Make notes that:

• List the types of EM wave

• Compare the frequencty of radion waves and gamma rays

• Compare the rate of energy transfer by radio waves and gamma rays

• Give the equation that links frequency, wave speed and wavelength

Task 3b: Makes notes that:

• List uses of radio waves

• List uses of microwaves

• List uses of IR waves

• List uses of light

• Explain how frequency and light are related

• Describe how optical fibres work

Task 3c: Complete and mark the exam question

Task 4c: Make notes that:

• Define emission

• Describe the process of heat transfer through IR radiation

• Explain in terms of absorption, reflection and transmission why different coloured surfaces will heat and cool at different rates

• Write a method to investigate the effect of surface colur on IR emission.

Task 5c: Make notes that:

• Explain how amplitude modification is used to transmit signals.

• Explain why microwaves need to be used for satelite communications.

• Describe the advantages of using optical fibres over transmitter and receiver systems.

Task 6b: Make notes that:

• Define ionising

• List the uses of UV, X rays and gamma rays.

• List safety precautions that should be taken when using ionising radiation.

Task 6c: Complete and mark the exam question

Task 7b: Make notes that:

• Explain how x-rays can be used to make images of tissues inside the body.

• Define contrast medium and explain why it is used.

• Explain how x-ray therapy can be used to treat cancer.

Task 7c: Complete and mark the exam question

Task 8c: Make a mind map or single page revision summary of this topic

Complete the quiz for your set to check you understand this topic