Physics 1.1

Question	Answer
INFRARED RADIATION	Heat radiation is the transfer of heat energy by IR. * IR can be emitted by solids, liquids and gasses. * All objects are emitting and absorbing IR. * IR is emitted from the surface of an object
INFRARED RADIATION	If object is hotter than surroundings it emits>absorbs. (Cools down) * If object is cooler than surroundings it absorbs>emits. (Warms up) * The hotter an object is the higher the radiation in a given time.
INFRARED RADIATION	IR is emitted from the surface of an object. * Temperature, colour and shininess of a surface affect how much IR is emitted.
INFRARED RADIATION	Dark, matt surfaces absorb and emit more IR than light shiny surfaces. * Light, shiny surfaces reflect more IR making them great for reducing energy transferred by radiation
Kinetic Theory	The particles are the same- only the energy and arrangement of the particles are different. * The movement energy is known as kinetic energy.
Kinetic Theory Solids	Strong forces of attraction hold particles together in a regular/uniform arrangement. * Don't have much energy- can only vibrate about their fixed positions.
Kinetic Theory Liquids	Weaker forces of attraction. * Particles are close together but can move past each other at slow speeds in random directions. * Contain more energy than a solid.
Kinetic Theory Gases	Almost no forces of attraction * More energy than particles in a liquid. * Move around at high speeds in random directions.

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	Created by Becky.Hart almost 9 years ago