Electrons and energy levels 4.0 / 5 based on 1 rating ? PhysicsElectrons and energy levelsASAQA Created by: Ami_BullCreated on: 22-02-16 16:30 What is a quantum of energy? A small packet of discrete energy 1 of 30 What is a photon? A discrete packet of electromagnetic energy 2 of 30 How can you calculate the energy carried by each photon? (2 equations) E=hf E=hc/lamda 3 of 30 What is the intesity of electromagnetic radiatin? energy transferred per unit time per unit area 4 of 30 What does intesity depend on? energy carried by a photon, the number of photons transferred and the area that they're incident on 5 of 30 What is the inverse square law? When intensity is inversley proportional to the square of the distance from the source 6 of 30 How do you convert joules into eV? divide J by 1.6x10-19 7 of 30 How do you convert eV to J? Multiply eV by 1.6x10-19 8 of 30 How do we calculate the work done in eV? W=VQ 9 of 30 What two types of energy does an electron have? Kinetic and elastic potential enrgy 10 of 30 Why do electrons have less energy closer to the nucleus? Work has to be done to move the electron away from the nucleus (as opposite charges attract) 11 of 30 When an electron absorbs a photon it can... Move up an energy level 12 of 30 When an electron moves down an energy level it... Emits a photon 13 of 30 What are quantisised energy levels? Energy levels with fixed energy values 14 of 30 What is the ground state? When electrons in an atom are in their lowest energy state 15 of 30 What is excitation? When an electron in an atom moves to a higher energy level after absorbing energy 16 of 30 Define ionisation When an atom gains o loses an electron and becomes charged 17 of 30 What is diffraction grating? a piece of transparent material ruled with very closely spaced lines used to see the diffraction of light 18 of 30 What is a continuous spectrum? When all frequencies of radiation or colours of light are possible 19 of 30 What is a line spectrum? A spectrum of discrete coloured lines of light 20 of 30 What is an emission spectrum? a bright spectrum seen when photons are emitted by atoms 21 of 30 When you hold salts over a bunsen burner why do they show a colured flame? Electrons all from one energy level to another emitting a photon that matches that particular colour of light 22 of 30 What is an absorbtion spectrum? A spectrum of dark linesseen on a coloured background produced when a gas absorbs photons 23 of 30 What is fluorescnece? when a substance absorbs short wavelength electromagnetic radiation and emits it at a longer wavelength radiation 24 of 30 What is a fluorescent tube? A type of light blb that gives out light when its inner coating fluoresces 25 of 30 What is thermionic emission? When free electrons are released from a heated filament 26 of 30 What is plasma? A mixture of ions and electrons in a gas 27 of 30 What vapour is inside fluorescent tubes? mercury 28 of 30 What coats the inside of a fluorescent tube? Phosphors 29 of 30 What is the process of thermonic emission? Accelration (cathode>anode)_mercury vapour_.collisons_excitation/ionisation_plasma_ground state_photons UV radiation_phosphor coating_absorbed_energy emitted_visible light and heat 30 of 30
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