Quantum revision by Olha

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Across
  1. 4. a series of bright lines against a black background(4,8,8)
  2. 6. the amount of energy needed to completely remove an electron from the atom from the ground state(10,6)
  3. 9. the p.d. needed to stop the fastest moving electrons(8,9)
  4. 11. the maximum kinetic energy of emitted electrons increases with the ______of the radiation(9)
  5. 12. the spread of the lines in the diffraction pattern increases if the _______ is greater(10)
  6. 14. if a photon Collier with a free electron, the electron will gain energy equal to ___(2)
  7. 15. the number of photoelectrons emitted per second is _______ to the intensity of the radiation(12)
  8. 16. the lowest energy state of the atom(6,5)
  9. 19. the minimum energy required to remove an electron from the surface of the material(4,8)
  10. 20. the minimum frequency of light which causes electrons to be emitted from a metal
Down
  1. 1. a phenomenon that shows that light behaves as both a particle and a wave(12,7)
  2. 2. the number of photoelectron emitted per second is proportional to the ________ of the radiation(9)
  3. 3. an atom with an electron removed(7)
  4. 5. the movement of an electron to a higher energy level(10)
  5. 7. the kinetic energy carried by an electron after it has been accelerated through a potential difference of 1 volt(12)
  6. 8. these are observed when accelerated electrons in a vacuum tube interact with the spaces in a graphite crystal(11,8)
  7. 10. an electron is emitted if the energy gained by it from a photon is _______ than the work function(7)
  8. 13. a discrete packet of EM radiation(7)
  9. 17. the wavelength for electrons accelerated in a vacuum tube is about the same size as electromagnetic waves in the ____part of the spectrum(4)
  10. 18. the energy carried by each photon is equal to the ______ in energies between the two levels(10)