Across
- 3. A He nucleus
- 6. Carried in discrete packets
- 7. a function that satisfies a wave equation and describes the properties of a wave.
- 10. Electrons removed from a metal during the Photoelectric effect
- 11. The minimum energy required to release a photoelectron from the surface of a metal
- 15. The probability that an individual nucleus will decay per unit of time
- 16. When a particle meets its antiparticle pair, the two will....
- 17. The time taken for the initial number of nuclei to halve for a particular isotope
- 18. a Photon
- 20. Unit for activity
- 21. There are certain pairs of physical quantities that are cannot be known precisely at the same time
- 22. The number of decays per unit time
- 23. The voltage required to stop photoelectron emission from occurring
Down
- 1. The number of photoelectrons emitted per second
- 2. Phenomena in which electrons are emitted from the surface of a metal upon the absorption of electromagnetic radiation
- 4. When a photon interacts with a nucleus or atom and the energy of the photon is used to create a particle–antiparticle pair
- 5. a quantum mechanical process where wavefunctions can penetrate through a potential barrier.
- 8. The minimum frequency of incident electromagnetic radiation required to remove a photoelectron from the surface of a metal
- 9. The scientist who proposed that electrons travel through space as a wave
- 12. a neutral subatomic particle with a mass close to zero and half-integral spin, rarely reacting with normal matterconstant,
- 13. The longest wavelength of incident electromagnetic radiation that would remove a photoelectron from the surface of a metal
- 14. An electron
- 19. ....then developed an equation that could be used to calculate the quantised energy levels for other atoms
- 20. ...showed that the angular momentum of an electron orbiting a hydrogen atom was quantised