Chapter 3: EM Spectrum

Class PowerPoint: EM waves

Online Electromagnetic Spectrum Activity

Must Do: Activity 1, 2 and ONE choice activity from the "May Do" list.

May Do: Activity 3, 4, 5, 6 , 7

MUST DO LIST:

Activity 1: Visible Light video - -

1) Describe what happens when white light is created.

2) Identify what the wave length would look like for the following colors

Blue Light

Yellow Light

Red Light

Activity 2: EM Spectrum

In this applet, you can click on the wavelength/frequency scale and change the wavelength and frequency by dragging the mouse around. You can also change the wavelength by using the arrow keys on your keyboard. Holding the shift key down while pressing the left or right arrow keys changes the wavelength by a factor of 10.

1. Fill in the missing parts of the EM spectrum.

2. Draw a wave relative to the wavelength and frequency above the spectrum provided,

3. Label arrows to the diagram showing increasing or decreasing:

- Wavelength

- Frequency

- Total Energy

1. What is the relationship between wavelength and frequency?

2. What type of waves have a wavelength of about a mile?

3. What type of electromagnetic radiation would be considered “safe” to be around, absorb?

4. Which color has: the highest frequency? lowest frequency?

MAY DO LIST:

Activity 3: Infrared Light - - IN YOUR NOTEBOOK……Move the infrared camera over the item and list the hottest and coldest parts of the item/picture. Do this for all 14 items. (you can change the item in the window ). Ex. Boys head, hot and cold cups, camel, etc…

Activity 4: Astronomical Observations - -

1. Describe the similarities and differences between different pictures of the same object. Based on what you know about the electromagnetic spectrum, provide an explanation for these similarities and differences.

2. Why are some telescopes used on Earth while others are launched into orbit above Earth's atmosphere?

3. Why is it that we are looking at images that are described as having taken place hundreds or thousands of years ago?

4. What information can be obtained from a conventional photograph of a human body that cannot be obtained from an X-ray, a thermograph -- an image taken with an infrared camera that records temperature variations on the surface of the body, and a magnetic resonance image (MRI) -- an image of internal organs and soft tissues produced with magnetic fields and radio waves. What does the X-ray tell that the photograph and other images do not?

5. Are the images of the human body described above a useful analogy for someone learning to understand why it's helpful to create different kinds of images of objects in space? Why or why not?

Activity 5: X-Rays

Read both articles and watch video embedded in article and second article

Read and answer questions provided:

  1. Who reads an x-ray?
  2. What is Radiotherapy?
  3. When and who discovered x-rays?
  4. How do X-Rays work?
  5. Name 3 medical uses of x-rays
  6. What is 4 OTHER uses of X-Rays?

Activity 6: Tour EM Waves - -

1. What are electromagnetic waves?

2. What is a photon?

3. Name one manufactured device or natural phenomenon that emits electromagnetic radiation in each of the following wavelengths: radio, microwave, infrared, visible light, ultraviolet, X-ray, and gamma ray.

4. Which type(s) of electromagnetic radiation do human bodies emit? Which type(s) can our senses detect?

5. List three ways that electromagnetic radiation is used to improve our everyday lives.

Activity 7: What is Spectroscopy

1. What is the difference between emission spectra and absorption spectra?

Look at the emission spectrum for the sun and the emission spectrum of hydrogen

2. What do you notice about the two?

3. Label the 7 colors of the rainbow on the light spectrum. [_____________________________________]

4. Predict where the spectrum emission lines would appear from a “blacklight”.

5. When astronomers find new planets outside our solar system they can sometimes tell if there is an atmosphere and the composition of the atmosphere. How do you think the astronomers can do this?

6. From your answers to the questions above, name the relationship between wavelength and frequency in waves that travel at the same velocity like the waves measured in these activities.

Activity 8:

How does your Smart Phone Work Video?

Take the EM Waves Quiz