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