Traditional Culture Encyclopedia - Photography and portraiture - High frequency photography
High frequency photography
The upper trolley moves in a straight line at a uniform speed, and the lower trolley moves in a straight line at a uniform speed;
Set the width s of each cell on the negative, and the corresponding time is t;
The speed of the car above: v=4St
According to the average speed at the intermediate moment is equal to the instantaneous speed, for the following cars, there are:
Speed at t2: v2 = 5s2t < v;;
Speed at t3: v3 =14s4t = 7s2t < v;
Speed at t4: v4 = 9s2t > v;;
So the time when the speed is equal appears at some time between t3 and t4, so ABC is wrong and D is right;
Therefore, choose: d.
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