4.湖南省衡阳市高三年级物理学科高考模拟试卷
湖南省衡阳市高三年级物理学科高考模拟试卷理科综合能力测试物理部分第I卷二、选择题:本题共8小题,每小题6分。共48分。在每小题给出的四个选项中,第14~18题只有一项符合题目要求;第19~21题有多项符合题目要求,全部选对的得6分,选对但不全的得3分,有选错的得0分。1.用如图甲所示的电路研究光电效应中光电流与照射光的强弱、频率等物理量的关系。图中A、K两极间的电压大小可调,电源的正负极也可以对调,分别用a、b、c三束单色光照射,调节A、K间的电压U,得到光电流I与电压U的关系如图乙所示,由图可知( )A.由欧姆定律可知,甲图中电压表的示数为零时,电流表的示数也为零B.由能量守恒定律可知,光...
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