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  • Infra red
    • invisible radiant energy
    • has longer wavelengths than those of visible light
    • Far infrared waves are thermal
    • used to heat food
    • replaced by rays of infrared light spreading throughout the room
    • All objects emit and absorb thermal radiation
    • this type of infrared radiation is given every day in the form of heat
    • Shorter and nearer infrared waves are not hot
    • At normal body temperature, humans radiate in the infrared at a wavelength of around 10 microns
    • To make infrared pictures we use special cameras that film and detect differences in temperature.


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