c/w 13 th october 2011
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C/W 13 th October 2011 Recap - Electromagnetic radiation. Keywords: electromagnetic spectrum photon transmit transparent absorb translucent vacuum. Objectives:. Must – Describe what the electromagnetic spectrum is. - PowerPoint PPT PresentationTRANSCRIPT
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C/W 13th October 2011Recap - Electromagnetic radiation
Keywords: electromagnetic spectrum photon transmit transparent absorb translucent vacuum
Objectives:Must – Describe what the electromagnetic spectrum is. Should – Describe how electromagnetic waves behave. Could – Electromagnetic waves of different frequency carry different amounts of energy.
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homework
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Electromagnetic Spectrum
Radio
Micro
Infra-Red
Light
Ultra-V
iolet
X rays
Gam
ma
Wavelength () increases
Can you think of a phrase that would help you remember this order? Gate X Usually Lets In Most Radiation
High frequency
Short wavelength
High energy
Most penetrating
High frequency
Short wavelength
High energy
Most penetrating
Low frequency
Long wavelength
Low energy
Least penetrating
Low frequency
Long wavelength
Low energy
Least penetratingx
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Gamma waves – the highest energy
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X-rays
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Ultra-violet waves
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Visible light
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Infra red
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microwaves
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Radio waves
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Starter – emag wave catch phrase.
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C/W 18th October 2011Recap - Radiation intensity
Keywords: intensity, photon, energy transfer.
Objectives:Must – Understand how energy is transferred by electromagnetic waves. Should – Understand what radiation intensity is. Could – Understand what things effect intensity
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C/W 20th October 2011Ionisation
Keywords: ionising radiation
Objectives:Must – Understand what ionising radiation isShould – understand how ionisation occursCould – Understand that ionisation can course damage to living cells.
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Ionisation
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Role play.........
Describe in 3 steps what is happening....Use the words, electron, ionisation, high energy photon
1. Before the photon gets there
2. As it arrives
3. After it has collided
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Questions 1 and 2 page 240
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Ionisation happens with high energy photons......Ie x-rays or gamma rays.....you cant just add the energy of lots of infra red rays for example.
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Why is ionisation harmful?
If this happens in your cells it can damage your DNA.
This can cause cancers......
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Question 3-4
Extension 5-6
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C/W 18th October 2011Ionisation
Keywords: ionising radiation
Objectives:Must – Understand what ionising radiation isShould – understand how ionisation occursCould – Understand that ionisation can course damage to living cells.