两块玻璃构成空气劈尖, 左边为棱边, 用单色平行光垂直入射, 若上面的平玻璃慢慢向上平移, 则干涉条纹( )
A. 向棱边方向平移, 条纹间隔变小
B. 向棱边方向平移, 条纹间隔变大
C. 向棱边方向平移, 条纹间隔不变
D. 向远离棱边的方向平移, 条纹间隔不变
E. 向远离棱边的方向平移, 条纹间隔变小
查看答案
在空气中有一劈尖形透明物,劈尖角q =1.0×10-4弧度,在波长l=700nm的单色光垂直照射下,测得两相邻干涉条纹间距l=0.25cm,此透明材料的折射率n=( ).
The engines with pistons are often called()
A. rotary engines
B. reciprocating engines
C. gasoline engines
D. internal combustion engines
In gasoline engines () are used to ignite the fuel - air mixture , producing the power .
A. gasolinel
B. spark plugs
C. diesel
D. three - sided rotor
Almost all compact cars are equipped with () engines .
A. 4 - cylinder
B. 6 - cylinder
C. 8 - eylinder
D. 1 2 - cylinder