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(2024高三上·南昌月考) </a> 2024年是中國航天大年，神舟十八號、嫦娥六號等已陸續(xù)飛天，部分航天器裝載了具有抗干擾性強的核電池。已知<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E38%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E90%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Sr衰變?yōu)?img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E39%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E90%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Y的半衰期約為29年；<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E94%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E238%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Pu衰變?yōu)?img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E92%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E234%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">U的半衰期約87年?，F(xiàn)用相同數(shù)目的<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E38%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E90%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Sr和<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E94%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E238%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Pu各做一塊核電池，下列說法正確的是（　　） </h1> <div id="rdo71mr" class="exam-s"> <span id="cpsyig3" class="op-item"><span id="4pxx1jz" class="op-item-nut">A . </span><span id="osuatsf" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E38%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E90%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Sr衰變?yōu)?img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E39%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E90%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Y時產生α粒子</span></span> <span id="p70f5l4" class="op-item"><span id="ejswz8j" class="op-item-nut">B . </span><span id="lht1hbk" class="op-item-meat"><img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E94%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E238%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Pu衰變?yōu)?img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E92%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E234%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">U時產生β粒子</span></span> <span id="qde1dlq" class="op-item"><span id="nzd4rji" class="op-item-nut">C . </span><span id="lmnoz7y" class="op-item-meat">50年后，剩余的<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E38%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E90%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Sr數(shù)目大于<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E94%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E238%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Pu的數(shù)目</span></span> <span id="lbsam8y" class="op-item"><span id="dg9mqin" class="op-item-nut">D . </span><span id="xtdklsr" class="op-item-meat">87年后，剩余的<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E38%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E90%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Sr數(shù)目小于<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E94%3C%2Fmn%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E238%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">Pu的數(shù)目</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="bgychq3" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="cfapcjr" class="g-sd2">  <div style="background:#fff;padding:20px 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