Physics- P6 Part B 0.0 / 5 ? PhysicsWavesGCSEAQA Created by: 13clarkenCreated on: 02-05-18 21:36 62137108549 Across 1. Optical cables are thin glass or plastic fibres carrying data- they use ... They work through reflection, bouncing along the cable until end of the fibre (7, 5) 4. ... lenses cave inwards, causing parallel rays of light to spread out (diverge) (7) 5. ... are produced with an alternating current in a circuit. They are mainly used for communication. Long-wave ... can bend (diffract) round curved surfaces. Short-wave ... are reflected by the ionosphere. Bluetooth short-wave ... (5, 5) 9. ... are used by satellites- they pass easily through the earths atmosphere. Microwave ovens use ... but at a different wavelength (10) Down 2. ... radiation is absorbed in fluorescent tubes. Its used in security pens and the sun emits it. People get artificially tanned under ... lamps (11) 3. ... frequency waves (Ultraviolet, Gamma rays and X rays) transfer lots of energy and can cause a lot of damage (4) 6. ... is when a wave crosses a boundary between materials at an angle and it changes direction. It depends upon speed of the wave which depends on the density of materials. Lower speed, wave bends towards the normal. Higher speed, wave away from normal (10) 7. ... are used in medicine- radiographers. They pass through flesh but not denser materials. They can be harmful (1, 4) 8. ... lenses bulge outwards, causing rays of light parallel to the axis to be brought together (converge) at the principle focus (6) 10. ... frequency waves (radio waves) pass through things easily and are harmless (3)
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