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Physics Core/AP 1 and 2

Chapter 28: 1-6 Assignment

Course Materials are always under revision! Weblecture content may change anytime prior to two weeks before scheduled chat session for content.

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Physics 28: 1-6 The Wave Function and Uncertainty


Reading Preparation

Text Reading: Giancoli, Physics - Principles with Applications, Chapter 28: 1-6.

Study Points

Key Equations

Uncertainty (postion and momentum) Δ x   Δ p x   h 2 π Δx: Error in position
Δp: Error in momentum
h: Planck constant
Uncertainty (Energy and time) Δ E   Δ t   h 2 π ΔE: uncertainty in energy
Δt: uncertainty in time
h: Planck constant
Energy for hydrogen electron at level n E n   =   13.6   eV n 2 n: Energy level
E: energy of electron at level n
13.6eV: Base energy level (electron in 1st orbital)
Angular momentum of electron L   =   l   ( l   + 1 )     h 2 π L: Actual Angular momentum
l: Angular momentum number, ranges 0 to n-1
Angular momentum direction/td> L z = m l h 2 π Lz: Angular momentum along z axis
ml: magnetic quantum number for electron

Web Lecture

Read the following weblecture before chat: Wave Functions and Uncertainty

Study Activity

Use the Hydrogen atom simulator at the University of Nebraska-Lincoln to explore the hydrogen atom.

  • Move the bar along the bottom grid to select a photon of a particular frequency, wavelength, or energy level. Start with eV = 0.03 (the minimum).
  • Fire the photon. What happens?
  • Set the photon to the first gride mark (0.97eV) and fire it. What happens?
  • Select a preset value like the Lα wavelength (Lyman series) and fire the photon. What happens? [Lyman series photons affect electrons in the first energy level!]
  • What happens if you fire a high energy photon at an already-excited electron?

Chat Preparation Activities

Chapter Quiz

Lab Work

If you want lab credit for this course, you must complete at least 12 labs (honors course) or 18 labs (AP students). One or more lab exercises are posted for each chapter as part of the homework assignment. We will be reviewing lab work at regular intervals, so do not get behind!