波的性质与类型
Wave Properties & Types
能用振幅、波长、频率和波速描述波；能区分横波（振动方向垂直于传播方向）和纵波（振动方向平行于传播方向）；并能运用波速公式 v = fλ。
Describe waves in terms of amplitude, wavelength, frequency, and wave speed; distinguish transverse waves (oscillation perpendicular to direction of travel) from longitudinal waves (oscillation parallel); and use the wave equation v = fλ
学习证据 / Evidence
- 在波的示意图上标出振幅、波长、波峰和波谷
- 区分横波和纵波，并各举出一个例子
- 能运用 v = fλ，根据其中两个量求出波速、频率或波长
- 解释当波速保持不变而频率增大时，波长会如何变化
- Labels a wave diagram with amplitude, wavelength, crest, and trough
- Distinguishes transverse and longitudinal waves and gives an example of each
- Uses v = fλ to calculate wave speed, frequency, or wavelength given the other two
- Explains what happens to wavelength if frequency increases while wave speed stays constant
评估问题 / Assessment
如果{{name}}被要求描述一种波以及它传播的快慢，他/她能画出波的示意图，标出波长和振幅，并用波速公式从频率和波长算出速度吗？
If {{name}} was asked to describe a wave and how fast it travels, could they sketch one, label the wavelength and amplitude, and use the wave equation to work out speed from the frequency and wavelength?