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Physics

Grade 12: Waves, Light and Sound

TermDefinition
Doppler effect The change in frequency (or pitch) of the sound detected by a listener, because the sound source and the listener have different velocities relative to the medium of sound propagation.
Photoelectric effect The process whereby electrons are ejected from a metal surface when light of suitable frequency is incident on that surface.
Threshold frequency, fo The minimum frequency of light needed to emit electrons from a certain metal surface.
Work function, Wo The minimum energy that an electron in the metal needs to be emitted from the metal surface.
Atomic absorption spectrum Formed when certain frequencies of electromagnetic radiation passing through a substance is absorbed.
Atomic emission spectrum Formed when certain frequencies of electromagnetic radiation are emitted due to an atom making a transition from a higher energy state to a lower energy state.
Created by: StiKManLabs
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