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The Photon Model

The photoelec...

Question

The photoelectric threshold wavelength for potassium (work function being 2eV) is

310 nm

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620 nm

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1200 nm

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2100 nm

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Solution

The correct option is B
620 nm

$λ = \frac{12375}{W_{0}} = \frac{12375}{2} = 6187.5 \circ A = 620 n m$

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