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【单选题】
在双缝干涉实验中,入射光的波长为λ,用玻璃纸遮住双缝中的上面那个缝,干涉条纹发生的变化有:A.
条纹间距变大;
B.
条纹间距变小;
C.
整体条纹向上移动;
D.
整体条纹向下移动.
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举一反三
【单选题】以下四种气体间隙的距离均为10mm,在直流电压作用下,击穿电压最低的是( )。
A.
球球间隙（球径50mm）
B.
棒板间隙（棒为负极）
C.
针针间隙
D.
棒板间隙（棒为正极）
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