1. Margin and Date What have you had Xraysor Gamma Rays for? When you see Rainbows and Prisms disperse white light what is happening? Questions Topic Date Purpose….. Produce Experiment Report that explains what happens inside your head when you see something.

2. Last Lesson • Gamma Rays – Nuclear radiation, light that goes through walls and buildings • Dispersion – Prisms spreading out different wavelengths • (Dr Argyros) • Wavelength measurer, Red is long, Blue is short. • Eye can see three colours

3. Light waves Copy • Lightis Electromagnetic (EM) Waves (1000,000,000 kmph) • Made by vibrating electricity • Amplitude is in Volts (per meter) • Radios and Mobile phones measure the Voltage of the air. • BlueTooth waves are a mixture of thousands of different channels so that some always get through

4. Copy • You can tell light is Electricity waves • Mobile Phones need batteries • Microwave oven sparks foil • Lasers spark at focus • Hear the electricity during an X ray

5. New Page Copy .5 .4 .7 ROYGBIV Visible R I V U X Radio Infrared UV X-ray Gamma Ray Wavelength V

6. Experiment: After images New Page Copy • Aim: To see after images • Method: Student waves 2 sparlers in a ‘V’ shape at back of class room. • Prediction……………. • Observation…………. • Explanation…………. • Diagram: Draw a scale picture of your retina (20 mm circle) showing shape