1. C/W 2 nd November 2011 Microwaves Keywords: absorb microwave sample bias Objectives: Must – Understand the heating effects of radiation can damage cells Should – Know what microwaves can be used for. Could – Understand how risks can be assessed.

2. Starter  Why do microwave ovens cook potatoes but our phones don’t cook our heads? Write down 3 reasons in the back of your book. Microwave ovens are more intense Microwave ovens are on for longer Microwave ovens use a grater (or higher) frequency (so more energy)

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4. What type of electromagnetic wave would a paper clip in a plug produce? In P3 we will learn that mains electricity has a frequency of 50Hz So 50 Hz radio waves.

5. C/W 3 rd November 2011 Ozone Keywords: ozone Objectives: Must – Understand that ozone protects living organisms Should – Know whether to accept different risks

6. Electromagnetic Spectrum Radio Micro Infra-Red Light Ultra-Violet X rays Gamma 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 penetrating x

7. UV radiation  Produced by the sun the 3 rd highest energy after X-rays and gamma rays. So can be dangerous. We can also get UV lamps...... UV can be dangerous does anything protect us?

8. Thomas Midgley, Jr. Despite good intensions this chemist had a complete mare! 1 st he introduced leaded petrol.... Then using CFC’s in fridges...... These two developments had very serious negative effects on the environment.

10. Ozone protects us from some of the Suns UV rays., by absorbing them

11. Ozone sheet

12. This picture shows the hole in the ozone layer Why is this hole a problem? Write down 2 reasons in your book. 1)Ice caps melt 2)More chance of skin cancer

13. Higher level ! How is ozone made? Ozone is made when high energy UV radiation from the sun are absorbed by oxygen molecules and they react together making O 3 Ozone can react with other molecules like nitrogen, hydrogen, bromine and chlorine compounds. Which changes this part of the atmosphere.

14. Subheading - How can we protect ourselves from UV radiation? -sun cream -Cloths -Complete book problems page 246

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16. Plenary Tell your partner one thing you have learnt today, then swap, then tell somebody else. I will ask you what they have learnt!

17. Boswells physics blog http://boswellsphysics.blogspot.com/ http://www.youtube.com/watch?v=Ws6AAhTw7RA

18. C/W 3 rd November 2011 Ozone Keywords: ozone Objectives: Must – Understand that ozone protects living organisms Should – Know whether to accept different risks