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Chapter 16

Waves

Traveling Waves (行波)
Traveling Waves (行波)
A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. ...
Wave 参数
Wave 参数
The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be ...
波浪运动方程
波浪运动方程
Mathematically, the motion of a wave can be studied using a wavefunction. Consider a string oscillating up and down in simple harmonic motion, having a ...
绘制波函数
绘制波函数
Consider the wave equation for a sinusoidal wave moving in the positive x-direction. The wave equation is a function of both position and time. From the ...
波的速度和加速度
波的速度和加速度
A wave propagates through a medium with a constant speed, known as a wave velocity. It is different from the speed of the particles of the medium, which ...
横波的速度
横波的速度
The speed of a wave depends on the characteristics of the medium. For example, in the case of a guitar, the strings vibrate to produce the sound. The ...
解决问题:吉他弦的调音
解决问题:吉他弦的调音
In the case of stringed instruments like the guitar, the elastic property that determines the speed of the sound produced is its linear mass density or ...
波的动能和势能
波的动能和势能
All forms of waves carry energy; this is directly visualized in nature. For instance, the waves of earthquakes are so intense that they can shake huge ...
波浪的能量和力量
波浪的能量和力量
The total energy associated with a wavelength is the sum of the potential energy and the kinetic energy. The average rate of energy transfer associated ...
波的干涉和叠加
波的干涉和叠加
When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect ...
波的反射
波的反射
When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at ...
波的传播
波的传播
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second ...
驻波
驻波
Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a ...
驻波模式 - I
驻波模式 - I
A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. ...
驻波模式:II
驻波模式:II
The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions ...
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