Chapter 13 wave motion and sound a0a
Chapter 13 Wave Motion and Sound
Chapter 13 wave motion and sound 特征1:具有交替出现的密部和疏部 Expansions and compressions >特征2:各质点振动方向与波的传播方向平行。 振动方向传播方向 纵波是靠介质疏密部变化传播的,如声波, 弹簧波为纵波
Chapter 13 Wave Motion and Sound ➢ 特征1：具有交替出现的密部和疏部. Expansions and compressions ➢ 特征2： 各质点振动方向与波的传播方向平行。 纵波是靠介质疏密部变化传播的，如声波， 弹簧波为纵波。 振动方向 传播方向
Chapter 13 wave motion and sound Both a transverse wave and a longitudinal wave are said to be traveling waves because they both travel from one point to another. 1=03345838810u13213 仁=T/44878891213 4 tT/ o 8819y13 910 tT
Chapter 13 Wave Motion and Sound 1 2 3 4 5 6 7 8 9 10 11 12 13 t=0 4 5 6 7 8 9 10 11 12 13 1 2 3 t=T/4 7 8 9 10 11 12 13 6 3 4 5 2 1 t=T/2 6 3 4 5 2 1 7 13 8 10 11 12 t=T Both a transverse wave and a longitudinal wave are said to be traveling waves because they both travel from one point to another
Chapter 13 wave motion and sound 13-1 The Characteristic Quantities of wave: p327 波长九:沿波的传播方向,两个相邻的、相 位差为2π的振动质点之间的距离,即一个完整波 形的长度 The wavelength n of a wave is the distance between two successive crests xX A
Chapter 13 Wave Motion and Sound 13-1 The Characteristic Quantities of wave: p327 波长 ：沿波的传播方向，两个相邻的、相 位差为 的振动质点之间的距离，即一个完整波 形的长度. The wavelength of a wave is the distance between two successive crests. 2π O y A - A u x
Chapter 13 wave motion and sound 早周期T:波前进一个波长的距离所需要的时 a]. Period is the time required for one complete oscillation or one complete cycle of the wave to pass a given point along the line of travel 频率∫:周期的倒数,即单位时间内波动所 传播的完整波的数目. The frequency is the number of crests-or complete cycles-that pass a given point per unit time. f=1/ 振幅 Amplitude D: it is the maximum displacement of the elements from their equilibrium positions as the wave passes through them. The height of crest or the depth of a trough
Chapter 13 Wave Motion and Sound 周期 ：波前进一个波长的距离所需要的时 间. Period is the time required for one complete oscillation or one complete cycle of the wave to pass a given point along the line of travel. T f =1 T 频率f ：周期的倒数，即单位时间内波动所 传播的完整波的数目. The frequency is the number of crests—or complete cycles-that pass a given point per unit time. 振 幅 Amplitude Dm : it is the maximum displacement of the elements from their equilibrium positions as the wave passes through them. The height of crest or the depth of a trough