Infra-red- cooking in normal ovens, blue-tooth signals, heat cameras(burglar alarms, fire services); Ultraviolet- Sun beds, hardening polymers(e.g dentistry), security checks (e.g fluorecent writing on bank notes), kills bacteria;
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Card 7
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[radiation is energy carried by waves or or particles] Refraction: when any wave crosses through a boundry of media (substance) there is usually a achange of speed due to the different density which results in a change of direction , called refration
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Card 8
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Sound: sound is caused by vibrations and is carried through media (substances) by longitudional waves. sound can not pass through vacuum (space). People have the ability to hear sound from 20Hz to 20000Hz
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Card 9
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The tone is called the pitch which increases with frequency. the loudness is determined by amplitude and the distance from the source.
