The photoelectric threshold wavelength for a metal surface is 6600 -A - The work function for this is

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The photoelectric threshold wavelength for a metal surface is $6600 \circ A$ . The work function for this is

1.87 V

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1.87 eV

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18.7 eV

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0.18 eV

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6600 \circ A

The threshold wavelength for photoelectric effect of a metal is $6500 \circ A$ . The work function of the metal is approximately

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