# Electromagnetic Waves

Student Learning Objectives
Lessons / Lecture Notes
Important Equations
Example Problems
Pencasts
Applets and Animations

Student Learning Objectives

• To understand how induced electric and magnetic fields lead to electromagnetic waves.
• To apply the wave model to the electromagnetic spectrum.
• To understand the properties of different types of electromagnetic waves.
• To understand the concept of polarization.
• To calculate the intensity of light transmitted through a series of polarizing filters.

Lessons / Lecture Notes

The Physics Classroom (conceptual)

PY106 Notes from Boston University (algebra-based):

Introductory physics notes from University of Winnipeg (algebra-based):

HyperPhysics (calculus-based)

PHY2049 notes from Florida Atlantic University (calculus-based):

PHY2044 notes from Florida Atlantic University (calculus-based)

General Physics II notes from ETSU (calculus-based)

Important Equations

Example Problems

Problem 1
(a) The average distance to the sun from the earth is 92.58 million miles. How long does it take light from the sun to reach the earth? (Solutions)

(b) The human eye is most sensitive to light with a frequency of about 5.5 × 1014 Hz, which is in the yellow-green region of the electromagnetic spectrum. How many wavelengths of this light can fit across the width of your thumb, a distance of about 2.0 cm? (Solutions)

Problem 2
An initially unpolarized beam of light is sent through a stack of four polarizing sheets, oriented so that the angle between the polarization directions of adjacent sheets is 22o. What fraction of the incident intensity is transmitted by the system? (Solutions)

Pencasts

EM Waves
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