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OpenStudy (anonymous):

if a material has a work function of 2.0ev what is is the longest wavelength to which a photocathode made of his material?will be senstive? chalange to all of you

OpenStudy (anonymous):

The incoming photon' energy has to be higher than 2.0 eV. Photon energy depends on wavelength is given \[E=\frac{ hc }{ \lambda } \] you can find easily what the longest wavelength is.

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