Waves
Waves began on a RipStik on the sidewalk
This term I did not have a good stable run in which led to my centerline not remaining straight. I also had an unstable swizzle frequency which led to the wavelength shifting as I traveled down the paper. Perhaps the paper was too far to the east, but I wanted the paper in front of the bulk of the class on the stairs to the right.
The results of the RipStik run.
Wednesday I reinforced the concepts using a rope and stopwatch, then moved on to a meter stick vibration. I skipped the bouncing ball. And then used the laptop to run an oscilloscope program and a tone generator, tying sound to waves.
Thursday the class measured the speed of sound.
In the morning Trumaine (and Nicky) took on the clapping. The air was misty but rain did not fall.
While Jackleen strikes a pose, the class heads out. The clapper was placed in the shade of the Pterocarpus indica below the Nukap hut, just west of the intersection due to morning traffic.
Nicky and Trumaine were left to clap, with Nicky as also the communications officer.
On the road again. Ashley on towel duty. The morning class would go out as far as 500 meters obtaining a 343 m/s sound speed. The 28° Celsius morning projected a sound speed of 348 m/s, putting the experimental result within 2% of the predicted value.
The morning class would go out as far as 500 meters obtaining a 343 m/s sound speed. The 28° Celsius morning projected a sound speed of 348 m/s, putting the experimental result within 2% of the predicted value.
Latasha on the measuring wheel in the afternoon, Elianson on the clapping boards. This is the Pterocarpus indicus just to the east of the eastern entrance drive. Less traffic at 11:00
The gathered class.
Walking west following Latasha are Patricia and Keilani
The morning was cloudy, thus we started at 250 and moved westwards in 50 meter hops to 500 meters. In the afternoon the sun was out and I instructed Latasha to go to the next patch of shade.
The result was distances that began at 280 meters. A conversion chart provided the metric distances from the feet measured by the wheel.
Heading out under the sun looking for the next spot of shade
Latasha at 617 meters, a record distance as far as I know. Unable to clearly see the boards at this range, I was working from the glint of sunlight off of their upper surface as they came up. The afternoon session would obtain a speed of 348.875 m/s. At 30° Celsius the projected speed of sound was 349.5 m/s. This was within a tenth of a percent, roughly, effectively no disagreement with the published value. Note that the class was using the median time of multiple values. A few of the original raw time data sets were used to generate boxplots for the data dispersion.
The blue data points and line are from the 8:00 class, the orange data points and line are from the 11:00 class.
This term I did not have a good stable run in which led to my centerline not remaining straight. I also had an unstable swizzle frequency which led to the wavelength shifting as I traveled down the paper. Perhaps the paper was too far to the east, but I wanted the paper in front of the bulk of the class on the stairs to the right.
The results of the RipStik run.
Wednesday I reinforced the concepts using a rope and stopwatch, then moved on to a meter stick vibration. I skipped the bouncing ball. And then used the laptop to run an oscilloscope program and a tone generator, tying sound to waves.
Thursday the class measured the speed of sound.
In the morning Trumaine (and Nicky) took on the clapping. The air was misty but rain did not fall.
While Jackleen strikes a pose, the class heads out. The clapper was placed in the shade of the Pterocarpus indica below the Nukap hut, just west of the intersection due to morning traffic.
Nicky and Trumaine were left to clap, with Nicky as also the communications officer.
On the road again. Ashley on towel duty. The morning class would go out as far as 500 meters obtaining a 343 m/s sound speed. The 28° Celsius morning projected a sound speed of 348 m/s, putting the experimental result within 2% of the predicted value.
Latasha on the measuring wheel in the afternoon, Elianson on the clapping boards. This is the Pterocarpus indicus just to the east of the eastern entrance drive. Less traffic at 11:00
The gathered class.
Walking west following Latasha are Patricia and Keilani
The morning was cloudy, thus we started at 250 and moved westwards in 50 meter hops to 500 meters. In the afternoon the sun was out and I instructed Latasha to go to the next patch of shade.
Shirlynn on flag duty in the afternoon
Heading out under the sun looking for the next spot of shade
Latasha at 617 meters, a record distance as far as I know. Unable to clearly see the boards at this range, I was working from the glint of sunlight off of their upper surface as they came up. The afternoon session would obtain a speed of 348.875 m/s. At 30° Celsius the projected speed of sound was 349.5 m/s. This was within a tenth of a percent, roughly, effectively no disagreement with the published value. Note that the class was using the median time of multiple values. A few of the original raw time data sets were used to generate boxplots for the data dispersion.
The blue data points and line are from the 8:00 class, the orange data points and line are from the 11:00 class.
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