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Heat and light
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- 2. HEAT AND LIGHT •is the amount of thermal energy that an object has. • Temperature: tells us about how hot an object is
- 3. HEAT IS TRANSFERRED: •CONDUCTION: two objects are in contact and thermal energy is transferred from one object to the other. • CONVECTION: thought a gas or liquid. The molecules go up when we heat them up and go down when they cool down. • RADIATION: thermal energy is transferred through space by electromagnetic waves.
- 4. SOME MATERIALS ARE •CONDUCTORS: transfer thermal energy easily. • INSULATORS: do not transfer thermal energy easily.
- 5. EFFECTS OF THERMALENERGY • CHANGES IN STATE: changes are not permanent - melting: from a solid to a liquid - evaporation: from a liquid to a gas • EXPANSION: thermal energy causes the molecules to vibrate, as a result the material expands. • CHEMICAL CHANGES: are permanent, we can not go back to the initial state of matter.
- 6. LIGHT • is aform of energy that travels through air and space in waves. • We can see with our eyes thanks to light.
- 7. OBJECTS REACT TOLIGHT • TRANSPARENT: it doesn´t block light • TRASLUCENT: blocks some light but some passes thtough. • OPAQUE: blocks the light completely.
- 8. Basic laws oflight • REFLECTION: when light energy bounces off a surface and changes direction. • REFLACTION: when light passes through some transparent sustances, the light energy changes direction slightly.
- 9. How is lighttransformed into heat? • When light energy hits an object, some of the energy is absorbed by the object. This energy makes the molecules of the object vibrate faster. If we touch the object, we feel this vibration as heat
- 10. How is lighttransformed into heat? • When light energy hits an object, some of the energy is absorbed by the object. This energy makes the molecules of the object vibrate faster. If we touch the object, we feel this vibration as heat