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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

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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 (b ) 400nm (c ) 310 nm (d) 220 nm
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Correct Answer - C
`lambda(inÅ) = (12375)/(4.0) Å ~~ 3093 Å`
or `lambda ~~ 309.3 nm`
or `~~310 nm.`
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