5378966
Descrição
FlashCards por Joanna van Dyk, atualizado more than 1 year ago
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Criado por Joanna van Dyk
mais de 8 anos atrás
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| Questão | Responda |
| Uses of Gammma Rays | Sterilization of medical equipment Radiotherapy (destroying cancer cells) |
| Why can Radio waves be received at long distances from the transmitter? | They reflect off the ionosphere |
| Uses of infrared | optical fiber communication thermal imaging |
| Uses of ultraviolet | security ink e.g. detecting forged bank notes |
| What do all EM waves have in common? | They travel at the same speed |
| Why are Fluorescent lamps not harmful to humans even though they emit ultraviolet radiation? | The radiation is absorbed by a coating on the inside of the glass that emits visible light instead |
| How does a camera create a photograph using visible light? | They focus light onto a photosensitive surface |
| How can the amount of light entering the camera be controlled? | how big the aperture is and how long the surface is exposed to light with shutter speed |
| What can X ray exposure lead to? | mutations cancer |
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