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You are making photoelectric measurements on an electrode of an unknown metal. With zero potential difference...

You are making photoelectric measurements on an electrode of an unknown metal. With zero potential difference applied by the battery, you shine various freqencies of light on the cathode. You detect a small photocurrent for light with wavelength up to 451 nm. What metal is the electrode made of?

  

Copper

  

Aluminum

  

Gold

  

Iron

  

Sodium

  

Tungsten

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