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### 905-B: Electromagnetic Spectrum 1

• Topic Cluster: Waves
• Topic: The Electromagnetic Spectrum: Quantitative
• Objective: Memorize the Electromagnetic Spectrum and the colors separately in order from longest to shortest wavelength; relate different waves using the terms wavelength and frequency
• Content: Each color has a specific wavelength and frequency that defines that color; each type of electromagnetic wave has a specific wavelength and frequency that define that wave; wavelength and frequency are inversely proportional
• Level: 1

### Part 1: Colors

In this lesson, we will focus on six colors: Red, Orange, Yellow, Green, Blue, Violet. You can remember the colors in order using the acronym: ROY. G. BV (Indigo, which is slightly between blue and violet, is not typically included in the physics colors.)

Each color is caused by an electromagnetic wave of visible light. What makes each color is the wavelength and frequency of that electromagnetic wave.

There are 3 facts you need to know about wavelength and frequency of colors for this pod:

• Wavelength and frequency are inversely proportional.
When wavelength is longer, frequency is shorter.
When wavelength is shorter, frequency is longer.
• Red has the longest wavelength and violet has the shortest wavelength. As you move from red to violet, wavelength gets shorter.
• Violet has the highest frequency and red has the shortest frequency. As you move from violet to red, frequency gets lower.

Note that, when talking about wavelength, we say it is “longer” or “shorter,” but when discussing frequency we say it is “higher” or “lower.”

#### Questions:

1. Copy the six colors from longest wavelength to shortest wavelength. (It's repetitive, but copying does help build memory.
3. Which has a longer wavelength: red or violet?
4. Which has a longer wavelength: blue or yellow?
5. Which has a longer wavelength: green or orange?
6. Which has a shorter wavelength: yellow or green?
7. Which has a shorter wavelength: violet or blue?
8. Which has a shorter wavelength: green or blue?
10. Which has a higher frequency: red or violet?
11. Which has a higher frequency: green or red?
12. Which has a lower frequency: orange or blue?
13. Which has a lower frequency: violet or blue?
14. Which has a lower frequency: red or green?
15. Which has a higher frequency: yellow or green?

In the sentences below, fill in the blanks to describe the waves.

1. Compare RED WAVES and BLUE WAVES:
__________________ have a longer wavelength but ____________________ have a higher frequency.
2. Compare YELLOW WAVES and BLUE WAVES:
__________________ have a longer wavelength but ____________________ have a higher frequency.
3. Compare VIOLET WAVES and GREEN WAVES:
__________________ have a longer wavelength but ____________________ have a higher frequency.
4. Compare ORANGE WAVES and RED WAVES:
Orange waves have a ____________________ wavelength but a ___________________ frequency than red waves.
5. Compare BLUE WAVES and GREEN WAVES:
Blue waves have a ____________________ wavelength but a ___________________ frequency than green waves.
6. Compare YELLOW WAVES and VIOLET WAVES:
Yellow waves have a ____________________ wavelength but a ___________________ frequency than violet waves.

In the problems below, use the words wavelength and frequency to describe the differences between the waves. You should write sentences that sound like those written above.

1. Using the terms wavelength and frequency, compare red waves and green waves.
2. Using the terms wavelength and frequency, compare violet waves and blue waves.
3. Using the terms wavelength and frequency, compare orange waves and green waves.
4. Using the terms wavelength and frequency, compare yellow waves and violet waves.
5. Using the terms wavelength and frequency, compare blue waves and green waves.
6. Using the terms wavelength and frequency, compare red waves and violet waves.

### Part 2: The Electromagnetic Spectrum

The electromagnetic spectrum consists of seven different types of electromagnetic waves:
Radio Waves, Microwaves, Infrared Waves, Visible Light Waves, Ultraviolet Waves, X-Ray Waves, and Gamma Ray Waves

You can remember these, in order, using the acronym:
Raging Martians Invade Venus Using X-Ray Guns

What makes each electromagnetic wave different are two things: it’s wavelength and its frequency:

There are three things you need to know about wavelength and frequency of electromagnetic waves:

• Wavelength and frequency are inversely proportional.
When wavelength is longer, frequency is lower.
When wavelength is shorter, frequency is higher.
• Radio waves have the longest wavelength. Gamma Ray waves have the shortest wavelength. As you progress from radio waves to gamma ray waves, wavelength becomes shorter.
• Gamma ray waves have the highest frequency. Radio waves have the lowest frequency. As you progress from radio waves to gamma ray waves, frequency becomes higher.
1. Copy the seven electromagnetic waves from longest wavelength to shortest wavelength. (It's repetitive, but copying does help build memory.
3. Which has a longer wavelength: radio waves or gamma ray waves?
4. Which has a longer wavelength: ultraviolet waves or infrared waves?
5. Which has a shorter wavelength: X-Ray waves or microwaves?
7. Which has a higher frequency: radio waves or visible light waves?
8. Which has a higher frequency: microwaves or gamma ray waves?
9. Which has a higher frequency: infrared waves or X-Ray waves?

Using the concepts above, fill in the blank spaces below:

1. Compare X-Ray waves with Visible Light waves:
__________________ have a longer wavelength but ____________________ have a higher frequency.
2. Compare Infrared waves with Visible Light waves:
__________________ have a longer wavelength but ____________________ have a higher frequency.
3. Compare Ultraviolet waves with Radio waves:
__________________ have a longer wavelength but ____________________ have a higher frequency.
4. Compare Microwaves and Radio waves:
Microwaves waves have a ____________________ wavelength but a ___________________ frequency than Radio waves.
5. Compare X-Rays and Gamma Ray waves:
X-Rays waves have a ____________________ wavelength but a ___________________ frequency than Gamma Ray waves.
6. Compare Ultraviolet waves and Visible Light waves:
Ultraviolet waves have a ____________________ wavelength but a ___________________ frequency than Visible Light waves.

In the questions below, use the words “Wavelength” and “Frequency” to describe the difference between two types of waves. You should write sentences that sound like those written above:

1. Using the terms wavelength and frequency, describe the difference between visible light waves and infrared waves.
2. Using the terms wavelength and frequency, describe the difference between microwaves and ultraviolet waves.
3. Using the terms wavelength and frequency, describe the difference between X-Ray waves and radio waves.
4. Using the terms wavelength and frequency, describe the difference between visible light waves and gamma ray waves.
5. Using the terms wavelength and frequency, describe the difference between microwaves and visible light waves.
6. Using the terms wavelength and frequency, describe the difference between radio waves and gamma ray waves.