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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