论文部分内容阅读
人民教育出版社2010年4月第3版《物理·选修3-4》认为,有正弦波传播的介质中的质点在做简谐运动.但笔者查阅了相关书籍后发现这一说法欠妥.本文将从平面简谐波的波动方程和介质波的能量出发,分析机械波能量在空间上的分布、随时间的变化与能量传递的实质,通过与简谐运动进行对比,对新教材中关于机械波传播过程中介质中质点的运动作新的描述,即“简谐波是简谐运动在介质中的传播,介质中各质点做的是运动规律满足正弦(或余弦)图像的受迫振动”.
According to People’s Education Press, 3rd edition, Physics, Elective 3-4, April 2010, the particles in the medium with sine waves are doing simple harmonic motion, but the author found that this is a defect when he consulted the related books. Based on the wave equation of simple harmonic wave and the energy of dielectric wave, this paper analyzes the distribution of the energy of the mechanical wave in space, the change with time and the essence of energy transfer. By comparing with harmonic motion, The propagation of particles in the media as a new description of the movement, that is, “Simple harmonic is simple harmonic motion in the medium of the media, the particle is done by the law of motion to meet the sine (or cosine) image of the forced vibration ”.