Objectives

Identify the parts of the electromagnetic spectrum

Demonstrate the relationship between wavelength and frequency in the EM spectrum

AIM: What is the Electromagnetic Spectrum?

electromagnetic spectrum, radio waves, infrared rays, visible light, ultraviolet rays, x rays, gamma

rays

Roy G. Biv


Light is an electromagnetic wave

But we can see light.

Most E/M waves can not be seen!


Pure visible white light is actually made up of various colors of the

spectrum.

This rainbow of colors is clearly visible when looking at light

through a prism


Examine light through a prism or a spectrometer!

What do you see?


Roy g biv

When you look at light through a prism you may see something which looks like this!

Light through a prism is diffracted according to its frequency and

wavelength

Red has a longer wavelength

speed = Frequency x wavelength

AIM: What is the Electromagnetic Spetrum?

Red has a longer wavelength


Since the speed of light is constant

What can you conclude about its frequency

It must be smaller

Blue has a shorter wavelength


Since the speed of light is constant

What can you conclude about its frequency

Shorter wavelength = greater frequency!

Colors of the Spectrum

Long W/L Short W/L

Radio Waves: Have a long W/L.

What type of frequencies would they have?

Microwaves: What are microwaves?

Infrared: You can not see infrared waves.

You can feel them as heat

Visible Light: ROY G. BIV

Ultraviolet Ray: Can not be seen.

In sunlight. Causes sunburn.

Also used to kill bacteria

X Ray: Can not be seen. Have a short W/L.

What type of frequency do they have?

What are they used for?

Gamma Ray: Have a very short W/L.

What type of frequency do they have?

Used in nuclear physics

Shorter wavelength=

Higher Frequency

longer wavelength=

lower Frequency

Class Activity:

W/S Concepts 9-9


Homework:

INTERNET QUESTIONS


Objectives

Documents

Transcript of Objectives