Massachusetts Institute of Technology
Sign in | Create Account

Soap Film Oscillation

A wire frame is dipped in bubble solution and placed in front of a speaker. At certain frequencies, the soap film oscillates in symmetrical patterns called normal modes.

A light is reflected off the soap film through a lens onto the wall to show these normal modes as the frequency of the function generator is increased. The first set of normal modes occur at frequencies lower than we can hear with our ears, which is why you can't hear the speaker in the video until the frequency is increased.

Comments (1)

Try using the speed switcher button (says “HD Auto” by default) and select the lowest setting.

Posted over 3 years by brew

You need to log in, in order to post comments. If you don’t have an account yet, sign up now!

June 30, 2009 14:12
Creative Commons Attribution-NonCommercial (What is this?)
Additional Files

44797 times

More from MIT Department of Physics Technical Services Group

MIT Physics Demo -- Driven Mechanical Oscillator

MIT Physics Demo -- Driven Mechanic...

Added 6 years ago | 00:01:07 | 35642 views

MIT Physics Demo -- Back "emf" in a Large Solenoid

MIT Physics Demo -- Back "emf" in a...

Added over 6 years ago | 00:00:23 | 62645 views

Adjustable Capacitor with Dielectric

Adjustable Capacitor with Dielectric

Added over 5 years ago | 00:02:05 | 34820 views

Weighted Hacksaw Blade

Weighted Hacksaw Blade

Added 2 years ago | 00:00:54 | 3870 views

Paramagnetism Of Liquid Oxygen

Paramagnetism Of Liquid Oxygen

Added over 2 years ago | 00:02:22 | 8557 views

MIT Physics Demo -- Centrifugal versus Centripetal Motion

MIT Physics Demo -- Centrifugal ver...

Added almost 6 years ago | 00:01:18 | 32613 views