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Here are some data collected on a sample of cesium exposed to various energies of light. Light energy(eV) Electron emitted? Electron KE(eV) 3.87 no — 3.88 no — 3.89 yes 0 3.90 yes 0.01 3.91 yes 0.02 *1 eV (electron volt)=1.60×10−19 J. What is the threshold frequency ν0 of cesium? Express your answer numerically in hertz.