aqa a level physics paper 1
aqa a level physics paper 1 What is meant by work function (2) - ANS Minimum energy required by an electron to escape from (1) a metal surface (1) What is meant by ionisation energy? (2) - ANS Minimum energy required to remove an electron from an atom (1) from the ground state (1) Why do emitted electrons have a kinetic energy that varies up to a maximum value? (4) - ANS Energy of a photon is fixed/constant (1) Energy is required for electrons to overcome work function ø (1) Electrons deeper into/below the surface of the metal require more energy to overcome work function and therefore have less KE(1) Maximum KE = Energy of photon - work function ø (1) Explain how (bright ring) diagram is evidence of the wave-particle duality of electrons? - ANS Diffraction pattern maxima/minima (bright and dark areas) (1) Diffraction is a property of waves- proves wave-behaviour of electrons (1) What is meant by the ground state? - ANS The lowest energy state of an atom Explain the difference between excitation and ionisation (2) - ANS An electron receives a discrete amount of energy for BOTH (1) Excitation promotes an electron to a higher energy level Ionisation is when an electron receives enough energy to leave the atom
Información del documento
- Subido en
- 15 de junio de 2023
- Número de páginas
- 5
- Escrito en
- 2022/2023
- Tipo
- Examen
- Contiene
- Preguntas y respuestas
