Unit 9: Maxwell's Equations and Electromagnetic Waves

Introduction to Unit 9

Humans have been asking the nature of light for centuries. However, no satisfactory answer was given until electricity and magnetism were unified into electromagnetism, as described by Maxwell’s equations.  Energy from the sun (including visible light) reaches us by means of electromagnetic waves. Electromagnetic waves occur in an astonishing variety of physical situations, such as TV and radio transmissions, cellular phones, microwave oscillators, x-ray machines, and radioactive nuclei. So, it worth making a careful study of them. In this section, we will use Maxwell’s equations as the theoretical basis for understanding electromagnetic waves.

Intended Learning Outcomes

Having successfully completed this section, you should be able to:

• State the four fundamental equations that govern all electromagnetic phenomena;
• Describe electromagnetic waves in terms of frequency, wavelength, amplitude, and speed;
• Recognize the wide range of frequencies and wavelengths that make up electromagnetic spectrum;
• Explain how electromagnetic waves are produced;
• Calculate energy and power carried by electromagnetic waves.

Learning Activities

E-tivity 9.1: Read the attached handouts

E-tivity 9.2: Post any question or challenge you faced while reading the handouts. You are also invited to react on posted topics by your colleague(s) or by e-moderator(s)

E-tivity 9.3: After reading the handouts attached under this unit, attempt the questions of the quiz

E-tivity 9.4: After completing this unit (and the previous ones), attempt the questions of assignment #4