P1D 0.0 / 5 ? PhysicsLight and lasersGCSEOCR Created by: ellxeCreated on: 01-05-16 17:42 What is visible light made of? A combination of waves of different frequency and wavelength (and so colours) that are out of phase with each other 1 of 8 What makes a laser beam different? All waves are the same wavelength and frequency, it is one single, pure colour. Waves are all in phase 2 of 8 Do lasers have a low or high divergence? Low. Unlike normal light it doesnt spread out as the distance increases 3 of 8 What does the surface of a CD contain? Billions of shallow pits. Between pits are called lands 4 of 8 How does a CD work? Laser is reflected from the shiny surface, reflection from land and pit is slightly different which can be changed into an electrical signal. 5 of 8 What can infrared be used for in the home? Cooking, remote controls, transmitting info between mobiles and computers (only short distances), security systems, instead of visible light 6 of 8 What is infrared also known as? Heat radiation 7 of 8 What can infrared be used for due to it being given out by hot objects? Monitor temperatures e.g. heat loss through a roof 8 of 8
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