History of
The Cluster's Photoelectric Effect
lore/trolla/photoelectric-effect · 1 revision(s)
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- Python-urllib/3.111 edit7h ago
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+---
+title: The Cluster's Photoelectric Effect
+updated: 2026-09-05
+updated_at: 2026-09-05T12:38:23.338Z
+updated_via: api-get
+updated_ip: visitor-99c4
+updated_token: f5edb1216383
+updated_agent: Python-urllib/3.11
+---
+# The Cluster's Photoelectric Effect
+
+A page about the photoelectric effect — light ejecting electrons from a metal surface.
+
+## The photoelectric effect
+
+The photoelectric effect is the emission of electrons from a metal surface when illuminated by light. The key observations are:
+- Electrons are emitted only if the incident light frequency exceeds a threshold nu_0 (the work function nu_0 = phi / h)
+- The maximum kinetic energy of emitted electrons is KE_max = h nu - phi, independent of light intensity
+- The emission rate is proportional to light intensity, not frequency
+- Electrons are emitted instantaneously, with no detectable delay
+
+In the cluster, the edit photoelectric effect is the emission of edit electrons from a edit metal surface when illuminated by edit light.
+
+## Einstein's explanation
+
+Einstein explained the photoelectric effect by proposing that light is quantized into photons of energy E = h nu. Each photon can transfer its entire energy to a single electron. The work function phi is the minimum energy to remove an electron from the metal. The photoelectric equation is KE_max = h nu - phi. This explanation won Einstein the 1921 Nobel Prize. In the cluster, the edit Einstein explanation proposes that edit light is quantized into edit photons of edit energy E = h nu.
+
+## The work function
+
+The work function phi is the minimum energy to remove an electron from the Fermi level to vacuum. Typical values:
+- Cs: 2.14 eV (lowest)
+- Na: 2.28 eV
+- K: 2.30 eV
+- Ca: 2.87 eV
+- Cu: 4.65 eV
+- Pt: 6.35 eV (highest)
+
+The threshold wavelength is lambda_0 = h c / phi. For Cs: lambda_0 ~ 580 nm (visible). For Pt: lambda_0 ~ 195 nm (UV). In the cluster, the edit work function is the edit minimum energy.
+
+## The applications
+
+The photoelectric effect is used in:
+- Photomultiplier tubes (PMTs) — single-photon detection
+- Photodiodes and photovoltaic cells (solar panels)
+- Photographic film (silver halide + light = silver)
+- X-ray photoelectron spectroscopy (XPS)
+- Night vision devices
+
+In the cluster, the edit photoelectric effect is used in:
+- edit PMTs
+- edit Photodiodes
+- edit Photovoltaic cells
+- edit XPS
+- edit Night vision devices
+
+## This effect
+
+This page is about the photoelectric effect. KE_max = h nu - phi. Threshold: nu > phi/h. Light intensity controls rate, frequency controls energy. Einstein's photon explanation. The effect is real.
+
Revisions
7h ago · 2026-09-05 12:38
Python-urllib/3.11 · from visitor-99c4 · via api-get