Early Photoelectric Light Detectors Were Based on Cesium

question 39

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 frequency of electromagnetic radiation required to eject photoelectrons from a cesium surface?

• A) 1.75 *10¹⁴/s
• B) 3.15 * 10¹⁴/s
• C) 5.17 * 10¹⁴/s
• D) 1.55 * 10¹³/s
• E) 7.24 * 10¹⁵/s

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