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Heat, Sound and Light (Sound waves (major components of the ear (label a…

- - - - light can travel through a vacuum because it is composed of quanta called photons, and it is a property of photons that they require no medium of transmission.
  - - - Focal length measurement
      - Diagram of flat mirror reflection
- - - - In a conductor, energy can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of energy through them