Define threshold frequency in photoelectric effect .
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In radiation: The photoelectric effect. The photoelectric threshold frequency, symbolized by the Greek letter nu with subscript zero, ν0, is that frequency at which the effect is barely possible; it is given by the ratio of the work function symbolized by the Greek letter psi, ψ, to Planck's constant (ν0
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For a given surface, the emission of photoelectrons takes place only if the frequency of incident light is greater than a certain minimum frequency called the Threshold frequency.
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