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9 PS Light I AO
Light is a form of electromagnetic radiation that travels faster than sound at 300,000,000 m/s in straight lines or transverse waves. It can be reflected in either a smooth specular reflection from calm water or a diffuse uneven reflection from rippled water. Light is emitted from luminous objects or reflected from objects that do not emit light themselves.
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9 PS Light I AO
- 3. Light is aform of electromagnetic (EM) radiation energy that travels in transverse waves or straight lines.
- 4. Light travels fasterthan sound at a speed of 300, 000, 000 m/s. c = 300, 000, 000 m/s.
- 5. Light travels fasterthan sound. During a thunderstorm, you will notice that lightning strikes first. This is then followed by thunder.
- 6. Light travels instraight lines. To demonstrate this property, just close your eyes. Did you realise that you could not see any light?
- 7. There are sevendifferent types of EM waves.
- 8.
- 9. Each form oflight travels at the same speed in a vacuum.
- 11.
- 12. Smooth surfaces likethe calm water allows light to be reflected evenly. This is known as a specular reflection.
- 13. Rough surfaces likethe rippled and paddled water allows light to be reflected unevenly. This is known as a diffuse reflection.
- 14. Objects that emits(or produces) their own light.
- 15. Objects that reflectslight. Do not emit any light.
- 17. Light is emittedfrom luminous objects. Light hits an object and bounces off. Our eyes receives the light and is focused on the retina.
- 18. Visible light iscomposed of 7 colours of different wavelengths and frequencies.
- 19. When light hitsthe banana, all colours except for yellow will be absorbed.
- 20. The colour yellowwill be reflected and received by the retina in the eye to be interpreted.
- 21. Objects that allowall light to go through.
- 22. Objects that allowssome light to pass through.
- 23. Objects that donot allow light to pass through.
- 24. Transparent • Glass Translucent • Ice Opaque •Straw • Cutlery