Light, infrared, microwaves and radio waves 0.0 / 5 ? PhysicsWavesGCSEAQA Created by: Emma ClareCreated on: 31-05-17 20:18 What is light from ordinary lamps and the sun called? It is called white light. 1 of 10 What do all objects emit? All objects emit infrared radiation. 2 of 10 The hotter an object is... The more infrared radiation it emits. 3 of 10 What is infrared radiation absorbed by and what dangers does it come with? Infrared radiation is absorbed by the skin and it can damage, burn of kill skin cells because it heats up the cells. 4 of 10 What do optical fibres in communication systems use? They use infrared radiation because it is absorbed less than the visible light in the glass fibres. 5 of 10 Why is infrared used for remote controls and video equipment? It is used because suitable infrared pulses can easily be produced and detected electronically. 6 of 10 Why are infrared scanners used in medicine? They are used to detect infrared radiation emitted from hot spots on the body surface. This means the tissue underneath is unhealthy. 7 of 10 What do microwaves have a shorter wavelength than? They have a shorter wave length than radio waves. 8 of 10 What are microwaves used for? They are used for communications, such as satellite TV. 9 of 10 What is the range of radio wave frequencies? From 300,000Hz to 300 million Hz. 10 of 10
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