Sodium and copper have work functions of 2.3 | vedclass

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(C) The work function $\phi$ is related to the threshold wavelength $\lambda_0$ by the equation $\phi = \frac{hc}{\lambda_0}$.From this,we can see tha

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$2:1$

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(C) The work function $\phi$ is related to the threshold wavelength $\lambda_0$ by the equation $\phi = \frac{hc}{\lambda_0}$.From this,we can see that $\phi \propto \frac{1}{\lambda_0}$,which implies $\lambda_0 \propto \frac{1}{\phi}$.Given the work functions for sodium $(\phi_s = 2.3 \ eV)$ and copper $(\phi_c = 4.5 \ eV)$,the ratio of their threshold wavelengths is:$\frac{\lambda_s}{\lambda_c} = \frac{\phi_c}{\phi_s} = \frac{4.5 \ eV}{2.3 \ eV} \approx \frac{4.6}{2.3} = 2$.Therefore,the ratio is approximately $2:1$.

Sodium and copper have work functions of $2.3 \ eV$ and $4.5 \ eV$ respectively. The ratio of their threshold wavelengths is nearest to:

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