Question: Image intensifiers used in nightvision devices create a bright image from dim light by letting the light first fall on a photocathode. Electrons emitted by

Image intensifiers used in nightvision devices create a bright image from dim light by letting the light first fall on a photocathode. Electrons emitted by the photoelectric effect are accelerated and then strike a phosphorescent screen, causing it to glow more brightly than the original scene. Recent devices are sensitive to wavelengths as long as $900 \mathrm{~nm}$, in the infrared.

a. If the threshold wavelength is $900 \mathrm{~nm}$, what is the work function of the photocathode?

b. If light of wavelength $700 \mathrm{~nm}$ strikes such a photocathode, what will be the maximum kinetic energy, in $\mathrm{eV}$, of the emitted electrons? Image intensifiers used in nightvision devices create a bright image from dim

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