KS5 Waves and Quantum Physics

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Across
  1. 2. The constant linking photon energy and frequency (13)
  2. 3. A scientist who thought of a wavefront as a series of point sources (6)
  3. 5. The difference in distance travelled by two waves reaching a point (14)
  4. 7. A discrete packet of electromagnetic radiation energy (6)
  5. 8. The removal of an electron from an atom (9)
  6. 9. A point of maximum displacement on a stationary wave (8)
  7. 10. The process of an electron falling to a lower energy level, releasing a photon (12)
  8. 14. The combination of waves producing reinforcement or cancellation (12)
  9. 17. The position of a point within a wave cycle (5)
  10. 18. Emission of electrons from a metal when electromagnetic radiation is incident (13)
  11. 20. A point of zero displacement on a stationary wave (4)
  12. 22. When two or more waves overlap the resultant displacement is the sum of the individual displacements (13)
  13. 24. A wave formed by two identical waves travelling in opposite directions (10,4)
  14. 27. A discrete amount of energy (7)
  15. 28. A point on the screen with the lowest observed brightness (7)
  16. 29. A pattern of discrete wavelengths emitted by excited atoms (16)
Down
  1. 1. Describing entities that exhibit both wave and particle properties (12)
  2. 4. A unit of energy equal to the charge of an electron multiplied by one volt (12)
  3. 6. The process of raising an electron to a higher energy level (10)
  4. 10. The spreading of waves as they pass through a gap or around an obstacle (10)
  5. 11. Discrete allowed energy state of an electron in an atom (11)
  6. 12. The minimum frequency required to emit electrons from a metal surface (18)
  7. 13. Power transferred per unit area (9)
  8. 15. Waves with a constant phase difference and the same frequency (8)
  9. 16. The minimum frequency of a photon needed to cause photoemission from a metal surface (9,9)
  10. 19. The minimum energy needed to remove an electron from a metal (12)
  11. 21. The wavelength associated with a moving particle (8)
  12. 23. A point on the screen of the highest observed brightness (7)
  13. 25. A dark line in a continuous spectrum caused by absorption of specific wavelengths (14)
  14. 26. The change in direction of a wave due to a change in speed (10)