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Old Nov 9th 2011, 01:52 PM   #1
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Falling ball experiment

There was a "multiflash" photograph taken of a ball falling after being held and released (sth like this: http://upload.wikimedia.org/wikipedi...lling_ball.jpg)

a) Why is the picture likely to be somewhat blurred at the beginning?

My guess: because the ball moves too slow for the camera

b) Why is the picture likely to be somewhat blurred at the end?

My guess: because now the ball is too fast for the camera

c) These pictures are taken with a white or polished ball and a black background. Frieddie Jones tried to take a picture with a black ball against a white background. Result: no sign of the ball on the picture at all. How do you explain this.

My guess: Could it be that it has something to do with the black surface absorbing all the light? The moving object absorbs all the light, whilst the fixed object (the background) reflects all the light, so the movement cannot be recorded?

Please, tell me if my guesses are right or wrong and forgive me my poor English, but I'm not a native speaker, unfortunately.

Thanks in advance for any help.
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Old Nov 10th 2011, 12:52 AM   #2
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1. No, cameras can take better pictures with slower moving objects. It's just that when the ball is moving slowly, you get multiple pictures overlapping each other, so that the resulting effect is a mix of each individual picture, which appear as blurred.

2. Right.

3. As for this one, I'm not sure, but I think your answer is correct. I personally would think that one would see the black ball
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