Teacher Demonstration
Use the live model as a shared screen demonstration before students try their own predictions and observations.
Physics / Waves
Hydrogen Emission Spectrum Tracker
Use Hydrogen Emission Spectrum Tracker as a Tracker line-profile activity for hydrogen spectroscopy: calibrate the spectrum image, read luma peaks against wavelength, and match bright emission lines to the visible Balmer series.
1. Watch or Launch
Launch the Interactive
Open the simulation, adjust the controls, and compare what changes on screen before answering the concept-check questions.
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2. Big Ideas
Key idea This Tracker package analyses a photographed hydrogen emission spectrum. The line profile samples brightness (luma) along the spectrum image, so bright peaks on the luma-versus-wavelength graph identify the visible hydrogen Balmer emission lines.
What Students Can Learn
- Use calibration points to convert image position into wavelength.
- Read the line-profile graph as luma or intensity against wavelength.
- Identify narrow bright emission lines rather than treating the spectrum as object motion.
- Compare measured line positions with known hydrogen Balmer lines such as red H-alpha and blue-green H-beta.
Guiding Question
Which bright peaks in the line profile match the expected hydrogen emission wavelengths, and how reliable is the wavelength calibration?
3. Try the Investigation
Open the Line Profile
Use Tracker Online to view the hydrogen image and the selected profile A line across the spectrum.
Check the Calibration
Inspect the calibration points on the X axis so pixel position is interpreted as wavelength rather than distance travelled.
Read Bright Peaks
Use the luma graph to locate narrow intensity peaks. These peaks correspond to bright hydrogen emission lines.
Match the Lines
Compare the measured peak wavelengths with expected Balmer lines, then discuss uncertainty from exposure, line width, alignment, and calibration.
4. Teacher Notes
Lesson Use
Use this as a spectroscopy data-analysis activity. Students should treat Tracker as a line-profile measuring tool for an image, not as a motion tracker.
Discussion Prompts
Ask: What does the x-axis represent after calibration? Which luma peaks are strongest? Which lines look saturated or broad? How close are the measured peaks to expected Balmer wavelengths?
Teaching Moves
Have students mark the red, blue-green, and violet peaks on the graph before naming H-alpha, H-beta, or other Balmer lines. This keeps the conclusion tied to measured evidence.
5. Concept Check
These questions are generated from the topic and the concept illustrated by the simulation. Use them after students have explored the model.
Concept Score
Correct first attempts build a streak and unlock higher point multipliers on this device.
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Answer each question once to build your streak.
1. What is being analysed in this Tracker package?
2. What does the line profile mainly measure?
3. Why are calibration points important here?
4. What do narrow bright peaks in the luma graph represent?
5. What should a good conclusion compare?
Expert Challenge
Unlocks after 3 correct concept-check answers on this page.
1. What source evidence shows that this Tracker activity is about spectroscopy?
2. What does a strong peak on the luma graph mean?
3. Which evidence best supports identifying the red hydrogen line?
4. What measurement caution should students include?
5. What final explanation is most appropriate?
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