RADIATION AND LIFE

1. RAD IA TI ON AND LIFE MODULE P2 www.sciencetutors.zoomshare.com

2. On Earth, sunlight is filtered through the atmosphere, producing radiant heat and Ultra-Violet (UV) radiation SUN LI G H T www.sciencetutors.zoomshare.com

3. SUN LI G H T Most energy from the Sun is in the form of visible and UV radiation. www.sciencetutors.zoomshare.com

6. UV RADIATION Ultraviolet radiation (UV) is more energetic than visible radiation and therefore has a shorter wavelength. www.sciencetutors.zoomshare.com

7. BINGE SUN BATHING Survey shows that short, intense exposure to the sun in much hotter climate doubles your chances of getting the most fatal of skin cancer. TRUE OR FALSE ? And Why? www.sciencetutors.zoomshare.com

8. Overexposure to ultraviolet radiation (UV), can cause skin cancer and other serious health effects. Your Task Make a list of health problems caused by UV Acknowledgement of photo copied from www.supanet.com www.sciencetutors.zoomshare.com

9. UV radiation is both Beneficial and Damaging to Human. Class to discuss and note down answers using bullet points BENEFITS AND RISKS www.sciencetutors.zoomshare.com

10. 3 Minutes Task Describe at least any 3 ways that a person can reduce sunburn and the risk of skin cancer. Sunburn Skin cancer www.sciencetutors.zoomshare.com

11. Discuss and write down simple guidelines you can follow to protect against damage from the sun's harmful rays. Acknowledgement of photo copied from www.supanet.com www.sciencetutors.zoomshare.com

12. SUNLIGHT AND LIFE www.sciencetutors.zoomshare.com Why Do Plants Have Leaves?

13. Input And Out Energy In Photosynthesis www.sciencetutors.zoomshare.com PHOTOSYNTHESIS Input Energy comes from the light absorbed by the leaves Output Energy is provided by Respiration when starch is used up.

14. SUNLIGHT ENERGY & SELECTIVE ABSORPTION www.sciencetutors.zoomshare.com What is selective Absorption? Leaves absorb the red and blue light from sunlight when it falls on leaves but reflect other colours-This process is called selective absorption

16. www.sciencetutors.zoomshare.com A layer in the Earth's atmosphere that contains relatively high concentrations of ozone ( often written as O 3 ) is called OZONE LAYER OZONE OR O 3 LAYER

18. What effect do UV radiation have on Ozone? 3 Atoms of Oxygen in Ozone molecule

19. What effect do CFCs have on Ozone 3 Atoms of Oxygen in Ozone molecule

20. What action do we need to take to reduce damage to the ozone layer? 3 Atoms of Oxygen in Ozone molecule

21. GLOBAL WARMING www.sciencetutors.zoomshare.com CLIMATE CHANGE

23. MOBILE PHONES - COOKED BRAIN? Are Mobile Phones Safe? How safe are Mobile Phones? Class to discuss and note down answers . Homework What are the actual risk and perceived risk of using mobile phones www.sciencetutors.zoomshare.com