Sign In | Subscribe
Start learning today, and be successful in your academic & professional career. Start Today!
Loading video...
This is a quick preview of the lesson. For full access, please Log In or Sign up.
For more information, please see full course syllabus of Physical Science
  • Discussion

  • Study Guides

  • Practice Questions

  • Download Lecture Slides

  • Table of Contents

  • Related Books & Services

Bookmark and Share
Lecture Comments (7)

1 answer

Last reply by: Professor Ebs
Wed May 1, 2013 11:57 AM

Post by Yisrael Harris on April 30, 2013

Is the only difference between all of the different types of electromagnetic waves mentioned the wavelength / frequency, or are there other differences as well? If the former, then could you change a wave of one electromagnetic type into another by changing its frequency / wavelength?

1 answer

Last reply by: Professor Ebs
Wed May 1, 2013 11:52 AM

Post by Yisrael Harris on April 30, 2013

Are electromagnetic waves all transverse waves, as opposed to longitudinal waves?

0 answers

Post by Yisrael Harris on April 29, 2013

Nice example of refraction: http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/optpic/brokpen.jpg

1 answer

Last reply by: Professor Ebs
Wed May 1, 2013 11:50 AM

Post by Yisrael Harris on April 29, 2013

Nice example of a compressional wave: http://youtu.be/ubRlaCCQfDk

Waves

  • A wave transfers energy through matter and space without moving the matter.
  • Two main types of waves: Mechanical Waves and Electromagnetic Waves
    • Mechanical Waves – need a medium to travel through
    • Electromagnetic Waves – can travel through matter or empty space
  • Two types of mechanical waves: Longitudinal (Compressional Waves) move the matter back and forth in the same direction of the wave and transverse waves that move the matter at right angles to the direction of the wave.
  • Light waves travel faster than sound waves
  • Wave speed depends on medium the wave is traveling through.
  • Compression waves travel faster in liquids and solids than in gases.
  • Electromagnetic waves faster in gases and empty space than through liquids and solids.
  • Reflection occurs when waves strike and bounce off an object. Refraction occurs when a wave bends as it changes speeds as it travels from one medium into another. Diffraction occurs when waves bend as they move around an object.
  • Visible light are the wavelengths on the electromagnetic spectrum that can be detected by your eyes. All wavelengths of visible light make white light.
  • Light can be reflected, refracted, transmitted, absorbed by matter. Objects can only be seen if light reflects off the object.

Waves

What type of waves can travel through empty space?
Electromagnetic waves
What are the two types of mechanical waves?
Transverse waves and longitudinal waves
What type of wave is an ocean wave that travels up and down as it moves sideways through the water?
A transverse mechanical wave
The wavelength of ______ waves is measured from crest to crest or trough to trough.
Transverse
If you measure the number of crests or compressions that pass a point in one second, what are you measuring?
The frequency of transverse (crests) or longitudinal (compressions) waves.
Which type of wave travels faster in a solid than in a gas?
Compressional (longitudinal) waves
Why do you see the lightning before you hear the thunder (the sound of the lightning)?
Light waves travel faster than sound waves.
What are 4 different types of electromagnetic waves?
Radio waves, microwaves, infrared waves, visible light waves, ultraviolet waves, x-ray waves, and gamma waves.
What type of electromagnetic wave has the longest wavelength and the lowest frequency?
Radio waves
What makes visible light waves appear as different colors?
The sizes of the wavelengths are different for each color red has the longest wavelength, violet has the shortest.

*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.

Answer

Waves

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Waves 0:05
    • Introduction to Waves
    • Mechanical Waves
    • Electromagnetic Waves
  • Mechanical Waves 2:13
    • Transverse
    • Longitudinal (Compressional Waves)
  • Properties of Waves 7:26
    • Transverse and Compressional Waves: Wavelength
    • Transverse and Compressional Waves: Frequency (Hz)
    • Transverse and Compressional Waves: Amplitude
    • Wavelength and Frequency are Related
  • Wave Speeds 15:01
    • Wave Speeds
  • Behavior of Waves 18:06
    • Reflection
    • Refraction
    • Diffraction
  • Electromagnetic Waves 26:00
    • Electromagnetic Waves
  • Visible Light 30:49
    • Visible Light
    • Opaque
    • Translucent
    • Transparent
  • Example 1: Label the Transverse Wave 36:59
  • Example 2: Label the Compressional Wave 38:13
  • Example 3: What Happens to the Frequency of a Wave as the Wavelength Increases? 39:12
  • Example 4: Law of Reflection and Light Wave 40:48