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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

Correct Answer:

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