Atheists who love Science!

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Comment by Chris G on March 18, 2013 at 6:25pm

That make sense Kolten. I should have read the small print or thought about it rather than taking it at face value. It might be visible at night with lights if the speaker freq was near 60 cps.

Comment by Joan Denoo on March 18, 2013 at 12:12pm

Chris G, I had not thought of sound pollution. Of course! I wonder if there is a frequency that attracts wildlife?

Comment by Kolten on March 18, 2013 at 7:48am

It's only visible with a 24 fps camera, not the naked eye. Although there is a variation of the experiment that can be seen with the naked eye, but requires a strobe light.

Comment by Chris G on March 18, 2013 at 3:59am

At first I thought I wouldn't need to use my o-scope because the f-generator has a calibrated dial but after looking up Avian hearing thresholds and seeing frequencies as low as 30 Hz for Great Horned Owls I considered the other wildlife and nixed the idea as a permanent installation. Wildlife doesn't need another noise pollutant.

Comment by Tom Sarbeck on March 18, 2013 at 1:20am

PS. Higher frequencies than we humans hear might bother neighborhood dogs.

Comment by Tom Sarbeck on March 18, 2013 at 1:18am

Chris, if you also have an oscilloscope you can see your frequency generator's output.

Comment by Chris G on March 17, 2013 at 5:05pm

I have a frequency generator and will do that in the back yard if I can find an cheap weatherproof speaker and it doesn't bother the birds.

Comment by Joan Denoo on March 17, 2013 at 2:40am

I like The water + sound video. It would make an interesting bird water fountain, too.

Comment by Joan Denoo on March 17, 2013 at 2:33am

A simple, few words, repeated many times, and at least the initials begin to fit a concept of E=MC2. Thanks Ruth. 

Comment by Dallas the Phallus on March 16, 2013 at 8:32pm

That's why my pee does when I sneeze while taking a leak. 

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