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波的图象既是中等物理的教学重点,又是一个难点,本文试用“等效思维”的方法来突破这一教学难点。波在传播方向上的各质点的振动相位依次落后,这是波的最基本特征。在教学中,我们不妨将波的基本特征作如下三个“等效”: 等效1:波的基本特征在叙述上等效于:在波的传播方向上,后一质点总是重复前一质点的振动。等效2:振源不动,波向前传播,在宏
The image of wave is not only the teaching focus of medium physics, but also a difficult point. This paper tries the “equivalent thinking” method to overcome this teaching difficulty. The vibrational phase of each particle in the direction of propagation lags behind, which is the most basic feature of the wave. In teaching, we may wish to make the following three “equivalents” of the basic characteristics of waves: Equivalence 1: The basic characteristics of waves are narratically equivalent: in the direction of wave propagation, the latter particle is always repeated The vibration of the particle. Equivalent 2: The source is stationary, the wave propagates forward, in the macro