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来自相干波源的两列波叠加时要产生干涉现象。在路程差等于半波长偶数倍的地方振动最强,两列波在该点振动同相;而在路程差等于半波长奇数倍的地方振动最弱,两列波在该点振动反相。这一规律在教学中显得很抽象,我们自制的“波的干涉演示器”能直观地反映这一规律,将抽象化为具体,收到了较好的教学效果。一、材料规格 1.三块厚度均为3mm的透明有机玻璃板,其中200mm×80mm的一块,80mm×80mm的两块(边缘磨平)。 2.直径为3mm的铁丝两根,长度约分别为100厘米和40厘米。
The interference phenomenon occurs when the two waves from the coherent wave source overlap. When the path difference is equal to the even wavelength of the half wavelength, the vibration is the strongest, and the two columns of waves are in phase at the same point. The vibration is the weakest at the path difference equal to the odd multiple of the half wavelength, and the two columns of waves are in opposite phase at this point. This law is very abstract in teaching. Our self-made “wave interference demonstrator” can intuitively reflect this law, abstract it into concrete, and receive good teaching results. First, the material specifications 1. Three pieces of transparent organic glass plate thickness are 3mm, of which 200mm × 80mm piece, two 80mm × 80mm (edge polished). 2. Two wire diameters of 3mm, with lengths of approximately 100 cm and 40 cm, respectively.