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“Don’t Lose the Light”- a hands-on approach to exponential decay

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This lesson plan helps students understand exponential functions by using an LED circuit. LED luminosity decreases at an exponential rate as more are added in series. As students add more lights to the circuit they will see the brightness of the lights dim and by measuring luminosity with a simple cell phone app, the students can actually chart the decrease in luminosity and find a trend line.

Lesson Grade Level

10th Grade 11th Grade 12th Grade

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Grades: 7th Grade, 8th Grade, 9th Grade, 10th Grade, 11th Grade, 12th Grade
3 votes with an average rating of 0.7.

This a hands on activity that will have the students measure the frequency of a resonating glass bottle by using their cells phones. They will then combine with other groups to play a well known song