[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fiPUr-QxU1PqpN8jjwHKlbHG4V8oT9immbHYAQT5M9fU":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-05-16 03:40:15",12195948,[8,9,10,11],"媒质质元的振动动能增大时,其弹性势能减小,总机械能守恒","媒质质元的振动动能和弹性势能都作周期性变化,但二者的相位不相同","媒质质元的振动动能和弹性势能的相位在任一时刻都相同,但二者的数值不相等","媒质质元在其平衡位置处弹性势能最大",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},19,"daf38eb55cba13795edcae090ba95831","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F48eba3395437dd881b1b9275a0ad1028.png","大学物理Ⅰ（上）","cf672f8bf5e34dd4b62e3db3d2b44ada","","当一平面简谐机械波在弹性媒质中传播时,下述各结论哪个是正确的?( )",[21,32,41,50,59,68,71,80,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],12195943,[25,26,27,28],"方向总是相同","方向总是相反","方向有时相同,有时相反","大小总是不相等","一简谐横波沿 Ox 轴传播.若 Ox 轴上 P1 和 P2 两点相距λ\u002F8(其中λ为该波的波长),则在波的传播过程中,这两点振动速度的","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],12195944,[36,37,38,39],"2m","2.19m","0.5m","28.6m","频率为 100Hz,传播速度为 300m\u002Fs 的平面简谐波,波线上两点振动的相位差为π\u002F3,则此两点相距为",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":30,"type":31},[],12195945,[45,46,47,48],"4","2","16","1\u002F4","在同一媒质中两列相干的平面简谐波的强度之比是 I1\u002FI2 =4,则两列波的振幅之比A1\u002FA2是",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":30,"type":31},[],12195946,[54,55,56,57],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc9d14bca8d54bd3203e7c8cbd1a9ca3f.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fba0adeb0a53e28552433350f81ea10fd.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F84f5ecac71461b231ebc06609ad18529.jpg\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F095fb0895812958972df26fde665a391.jpg\">","一平面简谐波沿Ox 正方向传播,波动表达式为 y = 0.10 cos[2π(t\u002F2 - x\u002F4)+π\u002F2] (SI),该波在t=0.5s 时刻的波形图是",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],12195947,[63,64,65,66],"动能为零,势能最大","动能为零,势能为零","动能最大,势能最大","动能最大,势能为零","一平面简谐波在弹性媒质中传播时,某时刻某质元在负的最大位移处,则它的能量是( )",{"answer":69,"createTime":5,"id":6,"options":70,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],12195949,[75,76,77,78],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9b0ee9957e5d393e722c49303818f02e.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2bfdfc8e1acb34ed6d2d232841cdc3b6.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb5dd6682eca9ce2b6a5c297de5a499a5.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F711b444d16da468cef1aa8f12ffdc99a.png\">","一平面简谐波沿x 轴负方向传播,已知 x = b 处质点的振动方程为: y = Acos(ωt + φ0 ) ,波速为 u,则波的表达式为:( )",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],12195950,[84,85,86,87],"y2 = Acos(2πt - π \u002F 2)","y2 = Acos(2πt - π )","y2 = Acos(2πt + π \u002F 2)","y2 = Acos(2πt - 0.1π)","如图所示,S1 和 S2 为两相干波源,它们的振动方向均垂直于图面,发出波长为λ的简谐波,P 点是两列波相遇区域中的一点,已知S1P=2λ,S2P=2.2λ,两列波在P 点发生相消干涉,若S1 的振动方程为 y1 = Acos(2πt + π \u002F 2) ,则 S2 的振动方程为( ) \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff34590179c662b45a6ab31a52b11236f.png\">",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":30,"type":31},[],12195951,[93,94,95,96],"振幅相同,相位相同","振幅不同,相位相同","振幅相同,相位不同","振幅不同,相位不同","在驻波中,两个相邻波节间各质点的振动( )",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":31},[],12195952,[102,103,104,105],"A","2A","2Acos(2πx \u002F λ)","| 2Acos(2πx \u002F λ) |","沿着相反方向传播的两列相干波,其波动表达式为:y1 = Acos 2π (ν t - x \u002F λ)和y2 = Acos 2π (ν t + x \u002F λ).在叠加后形成的驻波中,各处的振幅是:( )"]