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Light and heat

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  • Change of state: Solid --> Liquid
    Melting
  • What are the three characteristics of light?
    Speed, colour and direction
  • _________________ occurs when light hits an object, passes and bends into another direction
    Refraction
  • Light travels in ____________________
    Straight line
  • Two examples of thermal insulators
    Glass, plastic, wood, wool
  • Transparent materials ______________ light pass through them. We ___________ see objects clearly
    let, can
  • Two examples of thermal conductors
    Water and metals (copper, aluminium, gold, steel...)
  • What colours can we see? Reflected or absorbed
    Reflected
  • The flow of thermal energy from one object to another is called _____________
    Heat
  • Lenses are examples of __________________
    refraction
  • Mirrors are an example of ________________
    Reflection
  • ______________ transfer heat very well
    Conductors
  • What are the three primary colours of light?
    Red, blue and green
  • When light hits a rough surface, the rays reflect in _____________________
    many directions
  • Opaque materials ______________ let light pass through them. We ______________ see anything
    don't, cannot
  • Example of a transparent material
    Glass
  • When light hits a smooth surface, all rays reflect in _________________
    one direction
  • Translucent materials let ______________ light pass through them. We can see objects, but _____________ clearly
    some, not
  • Example of an artificial light source
    Bulb, candle, torch
  • Example of a natural light source
    Sun
  • Light is the __________________ form of energy
    fastest
  • What are the three types of light materials?
    Transparent, translucent and opaque materials
  • What is light?
    It's a form of energy that let us see objects
  • What are the two types of light?
    Natural and artificial
  • Example of an opaque material
    Wood, metal
  • Change of state: gas --> liquid
    Condensation
  • White light is composed of _____________________
    7 colours
  • _______________ do not transfer heat very well
    Insulators
  • Example of a translucent material
    Plastic
  • Change of state: liquid --> solid
    Freezing
  • A change of volume is called ___________________
    Expansion
  • _____________________ occurs when light hits an objects and bounces in another direction
    Reflection
  • How do we make light?
    There is a chemical reaction
  • Change of state: liquid --> gas
    Evaporation
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