Traditional Culture Encyclopedia - Photography major - When someone takes a picture indoors with the window as the background, he just takes a pebble falling from a height outside the window. It is known that the exposure time of this photo is
When someone takes a picture indoors with the window as the background, he just takes a pebble falling from a height outside the window. It is known that the exposure time of this photo is
The actual length of the window frame of 100cm in the photo is 4 cm, so the actual length of the stone movement trace is:
△x = 1.6× 100 4 = 40cm = 0.4m
So the speed of the stone is about v = △×△ t = 0.40.02 = 20m/s.
According to v=gt of free fall, there are
t= v g = 20 10 s=2s
So choose B.
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