Revision_Thermal physics

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Across
  1. 5. the change in frequency of a wave in relation to an observer who is moving relative to the wave source.
  2. 9. the energy required to raise the temperature of 1 kg of the substance by 1 °C.
  3. 12. the surface of a liquid behaving like a stretched membrane due to the attracting forces from all of its neighbouring molecules.
  4. 14. opposite of conductors
  5. 16. The force of attraction between similar kinds of molecules
  6. 17. The empty space between the molecules is called _____ space.
  7. 19. energy is transferred through a material from a warmer place to a cooler place without the material itself moving.
Down
  1. 1. anything that occupies space and has mass.
  2. 2. Change in the size of a substance due to heating
  3. 3. There is no molecular motion at ______ zero.
  4. 4. Metal objects heat up easily because their ______ are low.
  5. 6. The study of light and the interaction of light and matter
  6. 7. angle of ______= angle of reflection
  7. 8. طاقة متحركة
  8. 10. The volume of a fixed mass of gas is inversely proportional to its ______.
  9. 11. energy is transferred through a material from a warmer place to a cooler place by the movement of the material itself.
  10. 13. it is measured in hertz.1 Hz is one vibration per second
  11. 15. bending of rays of light when they travel from one material to another
  12. 18. speed that is close to speed of sound