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The minimum energy of an electron that must have in order to escape from the metal surface is called __________. (Stopping potential, work function, threshold frequency, wavelength)

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Work function
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work function
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threshold frequency
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work function
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Workfunction
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work function. work function is the least energy necessary to free an electron from a metal surface.
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work function is the least energy necessary to free an electron from a metal surface.
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work function
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