Physics Crossword Week 4

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Across
  1. 2. a ____ object partially transmits light (11)
  2. 4. unit named after a French physicist (7)
  3. 5. planet covered in iron(III) (4)
  4. 6. an astronomer burned at the stake for stating the Earth orbited the Sun (7)
  5. 9. increases when current increases (11)
  6. 12. birthplace of a star (6)
  7. 14. the number of SI base units (5)
  8. 17. below the lower limit of human audibility (10)
  9. 18. used to change the potential difference of an AC supply (11)
  10. 20. type of reflection where a wave is reflected by a smooth surface (8)
  11. 21. science of the relationship between heat, energy, work (14)
  12. 23. relativity known as Einstein’s theory of gravity (7)
  13. 24. ma (5)
  14. 25. sound waves with frequencies higher than 20,000 Hz (10)
  15. 27. a circuit component (5)
Down
  1. 1. the “a” in laser (13)
  2. 3. reduces frictional forces (11)
  3. 7. a way to treat cancer using ionising radiation (12)
  4. 8. ratio of image size to object size (13)
  5. 10. a wave behaviour (10)
  6. 11. type of magnet that produces its own magnetic field (9)
  7. 13. the particle in Newton’s theory of light (9)
  8. 15. one of the founders of quantum theory (4)
  9. 16. discoverer of the law of refraction of light (8)
  10. 19. forces lying in the same 2-dimensional plane (8)
  11. 22. a branch of physics concerned with sound (9)
  12. 26. to split a force into perpendicular components (7)