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如图所示为一真空示波管，电子从灯丝K发出（初速度不计），经灯丝与A板间的加速电场加速，从A板中心孔沿中心线KO射出，然后进入两块平行金属板M、N形成的偏转电场中（偏转电场可视为匀强电场），电子进入M...
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高三下学期物理《》真题及答案
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如图所示为真空示波管的示意图电子从灯丝K.发出初速度不计经灯丝与A.板间的加速电压U.1=18kV加
如图所示为一真空示波管电子从灯丝K.发出初速度不计经灯丝与A.板间的加速电压U.1加速从A.板的中心
示波管是一种多功能的电学仪器它的工作原理可以等效成下列情况如图所示真空室中电极K.发出电子初速度不计
B.间的中心线射入板中。当A.
间电压为U
2
时，电子偏离中心线飞出电场打到荧光屏上而显示亮点。不计电子重力，下列情况中一定能使亮点偏离中心距离变大的是( ) A.U
1
变大，U
2
变大 B.U
1
变小，U
2
变大
U
1
变大，U
2
变小
U
1
变小，U
2
变小
如图为一真空示波管的示意图电子从灯丝K.发出初速度可忽略不计经灯丝与A.板间的电压U.1加速从A.板
如图所示为一真空示波器电子从灯丝K.发出初速度不计经灯丝与A.板间的加速电压U.1加速从A.板中心孔
如图所示为一真空示波管电子从灯丝K.发出初速度不计经灯丝与A.板间的加速电压U.1加速从A.板中心孔
如图所示为示波管中电子枪的原理示意图示波管内被抽成真空
为发射电子的阴极，K.为接在高电势点的加速阳极，A.K.间电压为U.，电子离开阴极时的速度可以忽略，电子经加速后从K.的小孔中射出的速度大小为v。下列说法中正确的是( ) A.如果A.K.间距离减半而电压仍为U.，则电子离开K.时的速度仍为2v
如果A.K.间距离减半而电压仍为U.，则电子离开K.时的速度变为v/2
如果A.K.间距离不变而电压减半，则电子离开K.时的速度变为
v
如果A.K.间距离不变而电压减半，则电子离开K.时的速度变为v/2
下图为真空示波管的示意图电子从灯丝K.发出初速度可忽略不计经灯丝与A.板间的电场加速后从A.板中心孔
如图所示为一真空示波管电子从灯丝K.发出初速度不计经灯丝与A.板间的加速电压U.1加速从A.板中心孔
右图所示为真空示波管的示意图电子从灯丝K.发出初速度不计经灯丝与A.板间的加速电压U1加速从A.板中
如图所示为一真空示波管电子从灯丝K发出初速度不计经灯丝与A板间的加速电压U1加速从A板中心孔沿中心线
如图为一真空示波管的示意图电子从灯丝K.发出初速度可忽略不计经灯丝与A.板间的电压U.1加速从A.板
示波器的核心部件是抽成真空的示波管.若示波管的加速电压为U1偏转电压为U2偏转电场两板间距为d板长为
如图所示为一真空示波管电子从灯丝K.发出初速度不计经灯丝与A.板间的加速电压U1加速从A.板中心孔沿
示波管是一种多功能电学仪器它的工作原理可以等效成下列情况如图所示真空室中电极K.发出电子初速度不计经
B.间的中心线射入板中.金属板长为L.，相距为d，当A.
间电压为U.
2
时，电子偏离中心线飞出电场打到荧光屏上而显示亮点.已知电子的质量为m，电荷量为e，不计电子重力，下列情况中一定能使亮点偏离中心的距离变大的是
A.U.
1
变大，U.
2
变大B.U.
1
变小，U.
2
变大
U.
1
变大，U.
2
变小
U.
1
变小，U.
2
变小
如图所示电子从灯丝K.发出初速度不计在KA间经加速电压U.1加速后从A.板中心小孔射出进入由M.N.
如图所示为一真空示波管的示意图电子从灯丝K.发出初速度可忽略不计经灯丝与A.板间的电压U1加速从A.
如图所示为一真空示波管电子从灯丝K.发出初速度不计经灯丝与A.板间的加速电压从A.板中心孔沿中心线K
如图所示一示波管偏转电极的长度为d两极间的电场是均匀的大小为E.E.垂直于管轴一个初速度为0的电子经
如图所示为一真空示波管电子从灯丝K.发出初速度不计经灯丝与A.板间的加速电压U.1加速从A.板中心孔
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v 如果A.K.间距离不变而电压减半，则电子离开K.时的速度变为v/2 
A.U.1变大，U.2变大B.U.1变小，U.2变大 U.1变大，U.2变小 U.1变小，U.2变小
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