Chapter 13 wave motion and sound Chapter 13&14 Wave motion and sound 1. simple Harmonic Waves 2. Wave Equation 3. Energy and Power of Waves 4 Interference of waves 5. Standing Waves 6. The Doppler Effect
Chapter 13 Wave Motion and Sound Chapter 13&14 Wave Motion and Sound 1. Simple Harmonic Waves 2. Wave Equation 3. Energy and Power of Waves 4. Interference of Waves 5. Standing Waves 6. The Doppler Effect
Chapter 13 wave motion and sound Key words: Mechanical wave机械波 Electromagnetic wave电磁波 Transverse wave(横波) Longitudinal wave(纵波) crests(波峰) and troughs(波谷) Sinusoidal wave(正弦波) Traveling( moving, progressive)wave(行波 Standing( (stationary)wave(驻波) Stretched string(拉紧的线、弦线) Angular wave number(角波数 Interference of waves(波的干涉)
Chapter 13 Wave Motion and Sound Key words: Mechanical wave 机械波 Electromagnetic wave 电磁波 Transverse wave（ 横波） Longitudinal wave（纵波） crests (波峰) and troughs (波谷) Sinusoidal wave（正弦波） Traveling (moving, progressive) wave（行波） Standing (stationary) wave（驻波） Stretched string（拉紧的线、弦线） Angular wave number（角波数） Interference of waves（波的干涉）
Chapter 13 wave motion and sound 几个基本概念 定的扰动的传播称为波动,简称为波。 波动是振动的传播过程;振动是激发波动的波源。 机械波机械振动在弹性介质中的传播 波动 电磁波交变电磁场在空间的传播 两 类公机械波的传播需 两具有传播速度 波有传播振动的介质 类母能量传播 的 波日反射 的 不 同/电磁波的传播可不 共折射 之需介质,可在真空中 同干涉 处传播。 特 征日符射
Chapter 13 Wave Motion and Sound 一定的扰动的传播称为波动，简称为波。 波动是振动的传播过程；振动是激发波动的波源。 机械波 电磁波 波动 机械振动在弹性介质中的传播. 交变电磁场在空间的传播. 两 类 波 的 不 同 之 处 ❖机械波的传播需 有传播振动的介质; ❖电磁波的传播可不 需介质，可在真空中 传播。 具有传播速度 能量传播 反射 折射 干涉 衍射 两 类 波 的 共 同 特 征 几个基本概念
Chapter 13 wave motion and sound 813-2 Wave Types p327-331 Classification According to Natures of Matter 1. Mechanical waves 机械波:机械振动以一定速度在弹性介质中由近及远 地传播出去,就形成机械波。 Such as water waves, sound waves all these waves have certain central features: they are governed by Newtons laws, and they can exist only within a material medium(媒质、 介质), such as water,ai, and rock
Chapter 13 Wave Motion and Sound Classification According to Natures of Matter §13-2 Wave Types p327-331 1. Mechanical Waves 机械波: 机械振动以一定速度在弹性介质中由近及远 地传播出去，就形成机械波。 Such as water waves, sound waves. All these waves have certain central features: they are governed by Newton’s laws, and they can exist only within a material medium（媒质、 介质）, such as water, air, and rock
Chapter 13 wave motion and sound 2. Electromagnetic Waves 电磁波: Such as light, radio and television waves, X rays. These waves require no material medium to exist. Its speed through the vacuum iS299792458m/s Examples: Visible and ultraviolet light, radio and television waves, microwaves x rays and radar waves
Chapter 13 Wave Motion and Sound 2. Electromagnetic Waves 电磁波: Such as light, radio and television waves, X rays. These waves require no material medium to exist. Its speed through the vacuum is 299792458m/s. Examples: Visible and ultraviolet light, radio and television waves, microwaves, x rays, and radar waves