# Features of Electromagnetic Waves

\$0.00

## Description

To find out more about the diagram above . . . . read on!

#### Features of Electromagnetic Waves

Look carefully at the diagram at the top of the page. Now check out the following questions (and answers)!

1. Is the wave shown in the diagram travelling from left to right?
2. What is the term for the lowest point in the oscillation of a wave?
3. Is wavelength measured between the crests of successive waves?
4. What is the frequency of a wave?
5. What speed does a light wave travel at in a vacuum?

Introducing the diagram! Read back and forward between the image at the top of the page and the explanation below!

This diagram shows the key features of electromagnetic (light) waves and introduces some of the terms used to describe them.

• Across the centre is an electromagnetic wave, shown in red.
• The wave is travelling from left to right.
• The different features of the wave are shown by labels.
• At the bottom of the diagram are short definitions of key terms.

Remember that:

Follow the blue links for definitions . . . . or check the summaries of key terms below!

#### Some Key Terms

Move to the next level! Check out the following terms.

#### Amplitude

The amplitude of a wave is a measurement of the distance from the top of a crest through the centre line  (the still position, zero-point, mid-point) to the bottom of a trough.

In the case of an electromagnetic wave, amplitude corresponds with the perception of the intensity of light and the brightness of colour perceived by an observer.

#### Crest and trough

The crest is the point on a wave with the maximum value of upward displacement within a wave-cycle. A trough is the opposite of a crest, so the minimum or lowest point in a wave-cycle.

#### Frequency

The frequency of electromagnetic radiation (light) refers to the number of wave-cycles of an electromagnetic wave that pass a given point in a given amount of time.

#### Oscillation

Anis a periodic motion that repeats itself in a regular cycle. An oscillating movement is always around an equilibrium point or mean value. It is also known as a periodic motion.

#### Wave diagram

In physics and optics, a wave diagram uses a set of drawing conventions and labels to describe the attributes of light waves including wavelength, frequency, amplitude and direction of travel.

#### Slides

• Titles: All slides has titles.
• Backgrounds: Black, framed with a violet gradient.
• Size: 1686 x 1124 pixels (3:2 aspect ratio).
• Slides are available in three file formats: SVG, PNG, AI.

Slides (black backgrounds) are optimized for viewing on screen or with a projector.

Diagrams (white/transparent backgrounds) are optimized for printing on A4 pages in portrait format.

#### Diagrams

• Titles: No titles.
• Backgrounsd SVG: White.
• Backgrounsd PNG: Transparent.
• Backgrounds AI: Fully editable.
• Size: 1686 pixels wide. So all diagrams reproduce at the same scale when inserted into Word documents etc.
• Labels: Calibri 24pt Italic.
• Diagrams are available in three file formats: SVG, PNG, AI.

Diagrams (white/transparent backgrounds) are optimized for printing on A4 pages in portrait format.

Slides (black backgrounds) are optimized for viewing on screen or using a projector.

#### SVG file format

• Text on SVG images with black backgrounds has been converted from fonts to outlines.
• Text on SVG images with white (or transparent) backgrounds use Calibri 24pt Italic.

Did you know:

• SVG (.svg) stands for Scalable Vector Graphic.
• SVG files scale up or down without loss of definition because they are like line drawings.
• SVG files are much smaller in size than most other file formats (e.g JPEG or PNG).
• You can insert SVG files directly into MS Word 365 or PowerPoint 365.
• You can view SVG files by dragging the file into a browser tab.
• You can edit SVG files using programs such as Adobe Illustrator.

#### PNG file format

• Because all images are a standard width they reproduce consistently on an A4 page.

Did you know:

• PNG (.png) stands for Portable Network Graphics.
• PNG files are raster files as are JPG’s (.jpeg) files, so they behave like photos.
• Our PNG’s are 32bit files.
• You can insert or paste PNG’s directly into MS Word 365 or PowerPoint 365.
• You can view PNG files by dragging them into a browser tab.
• You can edit PNG files using programs such as Adobe Photoshop.