Quantum Phenomena 0.0 / 5 ? PhysicsQuantum physicsASAQA Created by: jatyizationCreated on: 11-01-14 18:16 What is the Photoelectric effect? Emission of electrons from a metals surface due to exposure to electromagnetic radiation 1 of 9 What is Excitation? Electron moved to a higher energy level 2 of 9 How is excitation caused? Collision of electrons or an atom absorbs a photon 3 of 9 What is the electron Volt? Unit of energy equal to the work done when an electron is moved through P.D of 1 volt 4 of 9 How are mercury atoms excited in fluorescent tube? electrons flow; collide with orbiting electrons; raising electrons to higher energy level 5 of 9 Why does photoelectric effect not occur below threshold frequency? Energy of photons depend on frequency; hence below threshold frequency photon does not have enough energy to liberate electron (idea of work function) 6 of 9 What Is wave particle duality? Matter particles have a wave-like and particle-like nature. e.g: photons 7 of 9 What is an example of particle-like nature of light? Photoelectric effect 8 of 9 What is an example of wave-like nature of light? Diffraction of light; Spreading of waves on passing through a gap 9 of 9
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