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