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Early Photoelectric Light Detectors Were Based on Cesium

Question 30

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 kinetic energy of the photoelectrons ejected from a cesium surface when exposed to blue light at 400 nm?


A) 5.41*10-18 J
B) 5.14 *10-20 J
C) 2.54*10-17 J
D) 1.54 *10-19 J
E) 2.54 * 10-19 J

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