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Becquerel was convinced that his hypothesis was supported when he observed that photographic plates wrapped in opaque material were still fogged after being exposed to uranium salts. This suggested that an invisible form of radiation was being emitted from the uranium, supporting his hypothesis that certain materials could emit energy without external stimulation.

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Q: How was becquerel convinced atfirst thathis hypothesis was supported?
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The bags shall be 15 inches square, not less than three nor more than five inchesthick, and filled with soft material.1.07 The pitcher's plate shall be a rectangular slab of whitened rubber, 24 inches by 6inches. It shall be set in the ground as shown in Diagrams 1 and 2, so that the distancebetween the pitcher's plate and home base (the rear point of home plate) shall be 60 feet, 6inches.3GRASS LINEBACKSTOP5' CIRCLE 5' CIRCLERADIUS FROMHOME BASE60'37' 37'60'6"1' MIN10' MAX1' MIN10' MAX13' 13'6'13'20'15'45'-0" 45'-0"6'90' 0"90' 0"FOUL LINEFOUL LINE95' RADIUSNEXT BATTER'S BOXNEXT BATTER'S BOXLEGENDBATTER'S BOX,CATCHER'S BOX, FOUL LINE,PITCHER'S PLATE, COACH'S BOXBASE LINES26' CIRCLE127-3 3/8"127-3 3/8"18' CIRCLENEXT BATTER'S BOXCOACH'SBOXCOACH'SBOXGRANDSTAND OR FENCE 60' FROM BASEOR FOUL LINE3'DIAGRAM NO. 1GRASS LINES3' 3'4LAYOUT ATSECOND BASELAYOUT ATTHIRD BASEFOUL LINEDIAGRAM NO. 2LEGEND1st, 2nd, 3rd BASESBATTER'S BOXCATCHER'S BOXHOME BASEPITCHER'S PLATEAA15"15"9090LAYOUT ATFIRST BASEFOUL LINEA9090B 6" 17" 6"DCB4'0"43"3'0"8'0"4'0"LAYOUT AT HOME BASELAYOUT AT PITCHER'S PLATESEE DIAGRAM NO. 3E81 "281 "23'0"ABCDE5