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现行北师大版九年级物理教材第十五章第一节《电磁波》在描述电磁波的波速、波长和频率的关系时,作了如下的描述:“……除了频率、波速(波的传播速度)以外,描述波的物理量还有波长.……相领两个波峰(或波谷)间的距离叫波长.波速与波的频率、波长的关系是波速=波长×频率.
The current Beijing Normal University’s edition of the ninth grade physics textbook, chapter fifteenth chapter ”Electromagnetic wave“ describes the relationship between the wave speed, wavelength and frequency of electromagnetic waves, as described below: ”...... In addition to frequency, velocity (wave propagation In addition to speed, the physical quantity of the wave is described as wavelength....... The distance between the two peaks (or troughs) is called the wavelength. The relationship between the wave speed and the frequency and wavelength of the wave is the wave speed = wavelength × frequency.