Solar Panel Threshold Frequency · AI Generator #GEN-917A5609

Physics · modern-physics

Problem

A spacecraft's emergency beacon uses a specialized photovoltaic cell made from a semiconductor with work function

\phi = 2.1\;\text{eV}

. During a solar storm, the spacecraft drifts into the shadow of an asteroid and can only receive reflected sunlight. The reflected light has been red-shifted, and the beacon stops functioning when the incident photons have wavelength

\lambda = 650\;\text{nm}

or longer. What is the maximum wavelength of light that can still trigger the photoelectric effect in this photovoltaic cell?

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