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A lightshines fromthe top of apole50 ft. high A ball isdropped from thesame height from a point30 ft. away fromthe light . If the shadow of theball movingat therateof 100lambda ft//sec alongthe ground 1//2sec. later [Assume the ballfalls a distance s= 16t ^(2) ft. in 't' sec ] then | lambda| is : |
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