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I vs V - Varying Frequency

The work func...

Question

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

A

540 nm

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B

400 nm

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C

310 nm

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D

220 nm

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Solution

The correct option is C 310 nm
$λ_{0} = \frac{h c}{W_{0}} - \frac{12400}{4} = 3100 Å = 310 n m$

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