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Mrs. Molnar from Philadelphia, PA is requesting other through DonorsChoose, the most trusted classroom funding site for teachers.

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Fully Funded

Mrs. Molnar's classroom raised $295

Dancing Flames: Visualizing Sound Waves

My students need a keyboard to use with our Rubens Tube to help them visualize sound waves.

Classroom photo
Mrs. Molnar Franklin Towne Charter High School
Philadelphia, PA Grades 9-12

My Students

Have you ever wondered what sound waves "look" like? A Rubens Tube allows my students to really "see" sound waves that otherwise are invisible. We have built a tube and it is ready to go. All we need is a keyboard to generate the pure tones that we will input into our tube.

My students are from Northeast Philadelphia, PA.

Over half are on free or reduced lunches and come from families struggling to make ends meet. Many will be the first in their families to attend college (we hope). We are a Charter School that demands a high level of commitment from them. At the same time, we commit our community to do whatever it takes to help them succeed in school and prepare them for college and life beyond.

My Project

A Rubens tube is simply a long, cylindrical gas burner. When you connect up a propane (gas grill) tank and light it, you see a row of small flames. But when you hook up a musical keyboard, well, that's when the magic happens. You see, each pure tone on a keyboard generates a sound wave with a certain frequency, or waveform. But of course, sound waves are invisible. When you connect the keyboard to the Rubens tube, the flames will instantly take on the shape of the sound wave. If you play a higher pitch (or tone), the frequency increases, and the students can literally "see" the waveform change (the peaks and valleys are closer together). Then if you play a lower tone, they see the waveform stretch out. If you play two or more tones together, they can see how waves can pile on top of each other or cancel each other out in places. (This is called interference). In short, this amazing, yet simple device allows them to "see the sound" and investigate different waveforms.

In Physics, we use Sound waves as a gateway to understanding the nature of waves in general.

Waves and wave energy are one of the foundational understandings in Physics. There are light waves, sound waves, radio waves, water waves, earthquake waves, and so on. The Rubens Tube and keyboard will provide an exciting and memorable introduction to this key content. With it, I hope to literally "ignite" their curiosity and get them wondering: "What else might be out there that I can't see?"

This project will directly impact historically underfunded classrooms.

Nearly all students from low‑income households

250 students impacted 1 donor
Mrs. Molnar Franklin Towne Charter High School Grades 9-12

This project will directly impact historically underfunded classrooms.

Philadelphia, PA View local requests

Nearly all students from low‑income households Data about students' economic need comes from the National Center for Education Statistics, via our partners at MDR Education. Learn more

250 students impacted 1donor

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Where Your Donation Goes

Where your donation goes
Materials Cost Quantity Total
Casio 76-Key Full-Size Keyboard • Best Buy $199.99 1 $199.99

Materials cost

$199.99

Vendor shipping charges

 $12.00

Sales tax

 $0.00

3rd party payment processing fee

$3.00

Fulfillment labor & materials

$35.00

Total project cost

$249.99

Suggested donation to help DonorsChoose reach more classrooms

$44.12

Total project goal

$294.11

How we calculate what's needed

Total project goal

 $294.11

1 Donor

-$249.99

Donations toward project cost

-$249.99

Donations to help DonorsChoose reach more classrooms

-$0.00

Excluded support for DonorsChoose

-$44.12

Still needed View calculationHide calculation

 $0.00

Our team works hard to negotiate the best pricing and selections available.

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Project Activity

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As a teacher-founded nonprofit, we're trusted by thousands of teachers and supporters across the country. This classroom request for funding was created by Mrs. Molnar and reviewed by the DonorsChoose team.

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