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In a particular photoelectric experiment, a stopping potential of 2.1V is measured with UV light λ...

In a particular photoelectric experiment, a stopping potential of 2.1V is measured with UV light λ =290nm incident on the unknown metal. A) using the same metal, what is the expected stopping potential expected when using 440nm light? B) what is the longest wavelength light that could possibly eject an electron from this metal?

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