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Early Photoelectric Light Detectors Were Based on Cesium

Question 34

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


A) 2.90 * 108 m/s
B) 2.90 *105 m/s
C) 5.81 * 102 m/s
D) 5.81 * 108 m/s
E) 5.81 *105 m/s

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