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Consider the photoelectric effect where light shines on a surface made out of an unknown metal....

Consider the photoelectric effect where light shines on a surface made out of an unknown metal. When yellow light is shown on the cathode, a current is detected in the circuit.

a) This light is removed and orange light is now shown on the cathode. Is it certain, or is it possible, that a current will be detected flowing through the circuit?

b) Now the orange light is removed and violet light is now shown on the cathode. Is it certain, or is it possible, that a current will be detected flowing through the circuit?

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