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The document outlines an educational activity designed to teach students about the Doppler effect in light, specifically focusing on redshift and blueshift. It includes materials needed, step-by-step instructions for demonstrations, and discussion questions to facilitate understanding of how these concepts apply to the motion of celestial objects. The activity aims to enhance students' comprehension of how astronomers utilize Doppler shift to gather information about the universe.

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philipjamespadayao05
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42 views1 page

Activity

The document outlines an educational activity designed to teach students about the Doppler effect in light, specifically focusing on redshift and blueshift. It includes materials needed, step-by-step instructions for demonstrations, and discussion questions to facilitate understanding of how these concepts apply to the motion of celestial objects. The activity aims to enhance students' comprehension of how astronomers utilize Doppler shift to gather information about the universe.

Uploaded by

philipjamespadayao05
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Title: **Light Shift Explorers: Redshift and Blueshift Adventure**

Objective: To understand the concept of Doppler shift in light and how it is used to study the motion of
celestial objects.

Materials Needed:

1. Flashlights (red and blue)


2. Colored transparent sheets (red and blue)
3. Whiteboard or chart paper
4. Markers
5. Optional: images of celestial objects (e.g., galaxies, stars)

Activity Steps:

Step 1: Introduction
- Start by briefly explaining the Doppler effect and how it applies to light waves, causing a shift in the wavelength of light
emitted by moving sources.
- Introduce the terms "redshift" and "blueshift," explaining that redshift occurs when light sources move away from the
observer, while blueshift occurs when they move towards the observer.
Step 2: Setup
- Divide the class into small groups and provide each group with a flashlight (red and blue) and colored transparent sheets (red
and blue).
- Set up a whiteboard or chart paper for each group to record their observations.
Step 3: Redshift and Blueshift Demonstration
- Instruct each group to shine the red flashlight through the blue transparent sheet and the blue flashlight through the red
transparent sheet.
- Ask students to observe and note down the color changes they see when the light passes through the different colored sheets.
- Explain that this simple demonstration simulates how the wavelength of light shifts towards the red (redshift) or blue
(blueshift) end of the spectrum due to motion.
Step 4: Celestial Objects and Doppler Shift
- Show images of celestial objects to the class, such as galaxies or stars, and explain how astronomers use Doppler shift to study
their motion.
- Discuss how redshift and blueshift in the light emitted by these objects provide valuable information about their velocity and
direction of movement relative to Earth.
Step 5: Group Discussion
- Facilitate a discussion within each group, encouraging students to share their observations from the demonstration and relate
them to the concept of Doppler shift in light.
- Guide students in discussing the significance of Doppler shift in understanding the universe and its applications in astronomy.

QUESTIONS:
a. What color changes did you observe when shining the red flashlight through the blue transparent
sheet and vice versa? How these observations relate to redshift and blueshift?

b. Can you describe how the Doppler effect applies to light waves based on the color changes you
observed during activity.

c. How do astronomers use Doppler shift to study the motion of celestial objects?

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