Early Photoelectric Light Detectors Were Based on Cesium

question 92

Multiple Choice

Early photoelectric light detectors were based on cesium. Cesium metal has a work function of 3.43 *10^-19 J. What is the minimum photon energy needed to eject photoelectrons from a cesium surface?

• A) 4.33 * 10^-17 J
• B) 3.34 *10^-18 J
• C) 3.43 *10^-20 J
• D) 3.43 *10^-19 J
• E) 1.99 *10^-21 J

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