The work function of a substance is 4.0 , eV. | vedclass

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(C) The work function $\phi_{0}$ is related to the threshold wavelength $\lambda_{max}$ by the equation: $\phi_{0} = \frac{hc}{\lambda_{max}}$.Given t

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$310$

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(C) The work function $\phi_{0}$ is related to the threshold wavelength $\lambda_{max}$ by the equation: $\phi_{0} = \frac{hc}{\lambda_{max}}$.Given that $\phi_{0} = 4.0 \, eV$ and the value of $hc \approx 1240 \, eV \cdot nm$,we can rearrange the formula to solve for $\lambda_{max}$:$\lambda_{max} = \frac{hc}{\phi_{0}} = \frac{1240 \, eV \cdot nm}{4.0 \, eV} = 310 \, nm$.Therefore,the longest wavelength of light that can cause photoelectron emission is $310 \, nm$.

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 ............ $nm$.

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