什么是波？（https://en.wikipedia.org/wiki/Wave）
In physics, a wave is an oscillation accompanied by a transfer of energy that travels through a medium (space or mass). Frequency refers to the addition of time. Wave motion transfers energy from one point to another, which displace particles of the transmission medium–that is, with little or no associated mass transport. Waves consist, instead, of oscillations or vibrations (of a physical quantity), around almost fixed locations.
There are two main types of waves. Mechanical waves propagate through a medium, and the substance of this medium is deformed. Restoring forces then reverse the deformation. For example, sound waves propagate via air molecules colliding with their neighbors. When the molecules collide, they also bounce away from each other (a restoring force). This keeps the molecules from continuing to travel in the direction of the wave.
在物理学中，波是能量在介质中传播引起的振动。
频率是波对时间的累积。波动将能量从一个点传递到另一个点，波动使得传输介质的粒子移位，伴随着少量（或者完全没有）的介质的质量传输。
波由固定位置（或接近固定，因为可能有少量的质量传输）附近的振动组成。
波主要分两类：物理波和电磁波，区别在于传播是否依赖其它介质，电磁波的传播不需要介质。传播过程中的分子碰撞过程中也有反作用里，使得分子的形状还原。
In physics, energy is a property of objects which can be transferred to other objects or converted into different forms but never created or destroyed.
能量是物体的一个属性，它可以被传递给其它物体，或者被转换成其它的形式，永远不能创造，也不能被销毁。（能量守恒定理）可以用焦耳（joule）或瓦特（watt）来度量。
热力学第一定律（first law of thermodynamics）
第二定律是说不能百分百转换，想起中学物理提到的为什么没有永动机了吗？
什么是属性呢？（https://en.wikipedia.org/wiki/Physical_property）
A physical property is any property that is measurable, whose value describes a state of a physical system.
其实这条wiki解释的是物理属性。物理属性是任何可度量的属性，属性值描述了物理系统的一个状态。
究竟什么是属性呢？（https://en.wikipedia.org/wiki/Property_(philosophy)）
In philosophy, logic, and mathematics, a property is a characteristic of an object; a red object is said to have the property of redness.
在哲学、逻辑学、数学里，属性是物体的特征。我们说一个红色的物体有红色的属性。
这条解释不彻底啊，可以继续追问下去，但是似乎已经到了非客观的领域了，我们就此打住吧。
总结：波是能量传递引起的振动，能量是物体的一个物理属性（可度量的物理属性，用焦耳度量），属性是一个物体的特征。换句话说，波是物体的特征（能量）传递引起的震动。
总结是不是很高深、很抽象啊？
Oscillation is the repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states.
振荡是关于中心值（通常是平衡点）或在两个或更多个不同状态之间的一些测量的重复变化，通常指时间上的。
什么是波长？（google关键字：what is wavelength）
PHYSICS
the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
物理学上的解释：相邻波峰之间的距离，尤指声波和电磁波里的点。
什么是频率？（https://en.wikipedia.org/wiki/Frequency）
Frequency is the number of occurrences of a repeating event per unit time.
频率是重复事件在单位时间内出现的次数。
频率、幅度、相位？
什么是色散？
光由不同的单色光组成，在不同的介质中，
the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
波的连续波峰之间的距离，特别是声波或电磁波中的点。
不同颜色的光速度相同吗？（http://physics.stackexchange.com/questions/29583/is-all-kind-of-light-same-speed）
Is all kind of light same speed?
The speed of light in vacuum is constant and does not depend on characteristics of the wave (e.g. its frequency, polarization, etc). In other words, in vacuum blue and red colored light travel at the same speed c.
The propagation of light in a medium involves complex interactions between the wave and the material through which it travels. This makes the speed of light through the medium dependent on multiple factors which include the frequency (other example factors being refraction index of the material, polarization of the wave, its intensity and direction).
The phenomenon due to which the speed of a wave depends on its frequency is known as dispersion and is the reason why prism and water droplets separate white light into a rainbow.
震动或波有3个属性：振幅、频率、相位（polarization），分别对
光栅为什么有色散？
参考什么是颜色？
颜色也是一种属性，什么是属性呢？
In physics, a wave is an oscillation accompanied by a transfer of energy that travels through a medium (space or mass). Frequency refers to the addition of time. Wave motion transfers energy from one point to another, which displace particles of the transmission medium–that is, with little or no associated mass transport. Waves consist, instead, of oscillations or vibrations (of a physical quantity), around almost fixed locations.
There are two main types of waves. Mechanical waves propagate through a medium, and the substance of this medium is deformed. Restoring forces then reverse the deformation. For example, sound waves propagate via air molecules colliding with their neighbors. When the molecules collide, they also bounce away from each other (a restoring force). This keeps the molecules from continuing to travel in the direction of the wave.
在物理学中，波是能量在介质中传播引起的振动。
频率是波对时间的累积。波动将能量从一个点传递到另一个点，波动使得传输介质的粒子移位，伴随着少量（或者完全没有）的介质的质量传输。
波由固定位置（或接近固定，因为可能有少量的质量传输）附近的振动组成。
波主要分两类：物理波和电磁波，区别在于传播是否依赖其它介质，电磁波的传播不需要介质。传播过程中的分子碰撞过程中也有反作用里，使得分子的形状还原。
In physics, energy is a property of objects which can be transferred to other objects or converted into different forms but never created or destroyed.
能量是物体的一个属性，它可以被传递给其它物体，或者被转换成其它的形式，永远不能创造，也不能被销毁。（能量守恒定理）可以用焦耳（joule）或瓦特（watt）来度量。
热力学第一定律（first law of thermodynamics）
第二定律是说不能百分百转换，想起中学物理提到的为什么没有永动机了吗？
什么是属性呢？（https://en.wikipedia.org/wiki/Physical_property）
A physical property is any property that is measurable, whose value describes a state of a physical system.
其实这条wiki解释的是物理属性。物理属性是任何可度量的属性，属性值描述了物理系统的一个状态。
究竟什么是属性呢？（https://en.wikipedia.org/wiki/Property_(philosophy)）
In philosophy, logic, and mathematics, a property is a characteristic of an object; a red object is said to have the property of redness.
在哲学、逻辑学、数学里，属性是物体的特征。我们说一个红色的物体有红色的属性。
这条解释不彻底啊，可以继续追问下去，但是似乎已经到了非客观的领域了，我们就此打住吧。
总结：波是能量传递引起的振动，能量是物体的一个物理属性（可度量的物理属性，用焦耳度量），属性是一个物体的特征。换句话说，波是物体的特征（能量）传递引起的震动。
总结是不是很高深、很抽象啊？
Oscillation is the repetitive variation, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states.
振荡是关于中心值（通常是平衡点）或在两个或更多个不同状态之间的一些测量的重复变化，通常指时间上的。
什么是波长？（google关键字：what is wavelength）
PHYSICS
the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
物理学上的解释：相邻波峰之间的距离，尤指声波和电磁波里的点。
什么是频率？（https://en.wikipedia.org/wiki/Frequency）
Frequency is the number of occurrences of a repeating event per unit time.
频率是重复事件在单位时间内出现的次数。
频率、幅度、相位？
什么是色散？
光由不同的单色光组成，在不同的介质中，
the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
波的连续波峰之间的距离，特别是声波或电磁波中的点。
不同颜色的光速度相同吗？（http://physics.stackexchange.com/questions/29583/is-all-kind-of-light-same-speed）
Is all kind of light same speed?
The speed of light in vacuum is constant and does not depend on characteristics of the wave (e.g. its frequency, polarization, etc). In other words, in vacuum blue and red colored light travel at the same speed c.
The propagation of light in a medium involves complex interactions between the wave and the material through which it travels. This makes the speed of light through the medium dependent on multiple factors which include the frequency (other example factors being refraction index of the material, polarization of the wave, its intensity and direction).
The phenomenon due to which the speed of a wave depends on its frequency is known as dispersion and is the reason why prism and water droplets separate white light into a rainbow.
震动或波有3个属性：振幅、频率、相位（polarization），分别对
光栅为什么有色散？
参考什么是颜色？
颜色也是一种属性，什么是属性呢？
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