Revison

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Across
  1. 2. The process of creating ions
  2. 4. Lowest frequency visible light
  3. 8. Charged atom
  4. 11. The energy values an atom can absorb
  5. 12. Allowed energy values of an atom
  6. 13. Speed of light divided by frequency
  7. 16. Minimum potential needed to stop photoelectric emission
  8. 19. An atom moves to a lower energy level
  9. 20. Planck’s constant times frequency
  10. 21. Minimum energy needed by an electron to escape a metal surface
Down
  1. 1. Matter particles have a wave like nature
  2. 3. Emission of light by a substance that has absorbed EM radiation
  3. 5. Highest frequency visible light
  4. 6. Only certain energy levels are allowed
  5. 7. Planck’s constant divided by the momentum of the particle
  6. 9. Lowest energy state of an atom
  7. 10. Work done when an electron is moved through a pd of 1 V
  8. 14. When an atom in the ground state has absorbed energy
  9. 15. The spreading out of a wave when passing through a narrow slit
  10. 17. When an atom absorbs energy without becoming ionised
  11. 18. Minimum EM frequency for photoelectric emission of electrons.