The Photographs:
In our experiment we used a Sony digital still camera to capture the pictures below. On the camera we had an f-stop of 6.7 throughout the experiment. The shutter speed remained constant at 1 second. The focal length was 5.2 mm. The ISO or film speed was 400. The flash mode was on the zero K resistance which minimizes the duration of the flash at about 1/30,000 of a second. The image resolution of the pictures was 1344 when we took them. The camera was approximately 10cm from the subject. We also used a Vivitar 283 flash unit that was triggered by a delayed photogate for the light source. The subject distance to flash was .3 meters through a mirror. The photogate was about 15 cm above the water. When the water drop passed through the photo gate a signal was sent to the flash unit to go off after a certain time. This flash unit provided the light needed to expose the film since we were taking pictures in the dark The delay time between the subject going through the photogate and the flash unit going off varied to get the different pictures. We first found the delay time for a drop above the water. Then we found a delay time for a drop to be half way in the water. Finally we found the delay time for when a drop first impacts the water. After we found the impact delay time we took a sequence of pictures with the delay time being 10ms between each other. In all the pictures we had a water height of 2.35 cm for experimental control.
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| dye40002.jpg | dye40004.jpg |
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Delay time: 207 ms In file dye40002.jpg, the water drop is just about to impact the water. It is oval because of the surface tension on the water. |
Delay time: 215 ms In file dye40004.jpg, half the drop is above and half is below. This is just when the water drop has impacted the pool. You can't see the bottom half because the water has ripples at the water level. |
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| dye40011.jpg | dye40016.jpg |
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Delay
time: 216 ms In
file dye40011.jpg, all the drop has entered the water to make a small
depression. |
Delay time: 226 ms The depression widens and deepens in file dye40016.jpg and a crow forms above the water. |
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| dye40018.jpg | dye40021.jpg |
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Delay
time: 236 ms The depression continues to widen and deepen and shows facets on the depression in file dye40018.jpg. |
Delay
time: 246 ms In
file dye40021.jpg, we believe that the depression is now shrinking and is
beginning to get flat. |
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| dye40023.jpg | dye40026.jpg |
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Delay time: 256 ms In file dye40023.jpg, the depression is basically staying the same. The waves could be caused by ripples in the container. |
Delay
time: 266 ms In file dye 40026.jpg, the depression is losing its bowl shape and is starting to flatten. Also note the bubble at the bottom. |
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| dye40029.jpg | dye40031.jpg |
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Delay
time 276 ms In file dye40029.jpg, the depression is flattening into a funnel form with a flat bottom. |
Delay
time 286 ms In file dye40031.jpg, the depression continues to flatten, and the spout is now forming above the surface of the water. |
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| dye40036.jpg | dye40038.jpg |
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Delay time 296 ms In file dye40036.jpg, the spout continues to heighten, take notice that the spout is ribbed and the big drop at the top is a separate drop coming down. |
Delay time 306 ms In
file dye40038.jpg, the spout smoothens and continues upward. |
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| dye40040.jpg | |
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Delay time: 316 ms In file
dye40040.jpg, the spout is at its pinnacle and a drop is now separating
from the spout.
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