2.1 Introduction
2.2 Generation of Electromagnetic Waves
2.2.1 Speed of Electromagnetic Waves
2.2.2 Direction of Propagation of Electromagnetic Waves
2.2.3 Doppler Effect of Electromagnetic Waves
2.3 The Electromagnetic Spectrum
2.4.1 Energy Carried by Electromagnetic Waves
2.4.2 Radiation Pressure
2. Summary
Unit 2 - Multiple Choice - Electromagnetic Waves Questions
Unit 2 - Multiple Choice - Electromagnetic Waves Answers
Unit 2.1 Multiple Choice Extended Questions - Waves
Unit 2.1 Multiple Choice Extended Answers-Waves
 

Unit 2 Electromagnetic Waves

2.2 Propagation of Electromagnetic Waves

2.2.1 Speed of Electromagnetic Waves

Consider an EM wave generated by a sinusoidal source.

This sinusoidal character is displayed by both the electric and magnetic fields.

The electric and magnetic fields obey the right hand rule.

Maxwell derived a formula for the speed of EM waves:

c = E/B

This works out to be 3 X 108 ms-1.

Hence for EM waves λ = c/f.

λ =[3X108ms-1]/f.

Example 1: Determine the wavelength and period of a sinusoidal electromagnetic wave of frequency 40.0 MHz travels in free space.

λ =[3X108ms-1]/f.

λ = 7.5m

 

     
Concept by Kishore Lal. Programmed by Kishore Lal... Copyright © 2015 Kishore Lal. All rights reserved.