---
title: "Monochromatic ultraviolet light with photon energy \\(8.23 \\times 10^{-19} \\text{ J}\\) shines on a clean sodium plate inside an evacuated chamber. The work function of sodium is \\(3.68 \\times 10^{-19} \\text{ J}\\), and the mass of an electron is \\(9.1 \\times 10^{-31} \\text{ kg}\\). What is the maximum speed of the photoelectrons ejected from the sodium plate?"
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date_modified: "2026-08-04T05:02:30+00:00"
---

# Monochromatic ultraviolet light with photon energy \(8.23 \times 10^{-19} \text{ J}\) shines on a clean sodium plate inside an evacuated chamber. The work function of sodium is \(3.68 \times 10^{-19} \text{ J}\), and the mass of an electron is \(9.1 \times 10^{-31} \text{ kg}\). What is the maximum speed of the photoelectrons ejected from the sodium plate?

Monochromatic ultraviolet light with photon energy \(8.23 \times 10^{-19} \text{ J}\) shines on a clean sodium plate inside an evacuated chamber. The work function of sodium is \(3.68 \times 10^{-19} \text{ J}\), and the mass of an electron is \(9.1 \times 10^{-31} \text{ kg}\). What is the maximum speed of the photoelectrons ejected from the sodium plate?

- **A.** \(7.1 \times 10^5 \text{ m/s}\)
- **B.** \(9.0 \times 10^5 \text{ m/s}\)
- **C.** \(1.0 \times 10^6 \text{ m/s}\)
- **D.** \(1.3 \times 10^6 \text{ m/s}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/116541/*