<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />
Skip Navigation

Chapter 23: Quantum Physics

Difficulty Level: At Grade Created by: CK-12
Turn In

A copper vapor pump laser used in an atomic experiment.

As science began to look at very small sizes down to the scale of an atom, our previous intuition about matter broke donw.  Quantum mechanics is the solution to what seemed like inconsistent behavior of atoms and light, that resolves dilemmas over what is a wave and what is a particle.  Lasers create a precise wavelength due to quantum mechanics, and are increasingly found throughout everyday life.  This chapter covers black body radiation and Planck's quantum hypothesis, photons and the photoelectric effect, and wave-particle duality. 

Chapter Outline

Chapter Summary

1. The Planck equation relates the energy of a photon of light to its frequency

where the constant is known as Planck’s constant.

According to the photoelectric effect, the maximum kinetic energy of the electrons ejected from a material is

where is the frequency of the light incident upon the material and is the work function of the material : the minimum energy needed to overcome the electrical forces that hold an electron within the material

The frequency corresponds to the minimum (threshold) frequency of light necessary to eject a photoelectron.

2. The De Broglie equation for the wavelength of matter waves is

where is the mass of a particle, its velocity and its associated wavelength.

Image Attributions

Show Hide Details
Difficulty Level:
At Grade
Date Created:
Jun 27, 2013
Last Modified:
Jun 07, 2016
Save or share your relevant files like activites, homework and worksheet.
To add resources, you must be the owner of the FlexBook® textbook. Please Customize the FlexBook® textbook.
Please wait...
Please wait...
Image Detail
Sizes: Medium | Original