9 If the motion responsible for the wave disturbance is periodic, a periodic wave, or wave train, is produced.
10 This wave motion is related to simple harmonic motion, but instead of one object vibrating about its equilibrium position, many particles do so.
11 Waves provide a mechanism by which energy is transmitted from one location to another without the physical transfer of matter between these locations.
12 A mechanical wave is a disturbance in the equilibrium positions of matter, the magnitude of which is dependent on location and on time.
13 This requires a source of energy and an elastic medium.
14 Periodic Waves - each individual particle repeats its motion once every certain time interval T, which is called the period of vibration. (Same as the pendulum)
15 The frequency of a periodic wave is the number of waves passing a given point in unit time.
16 Frequency is the number of cycles per unit time Frequency is the number of cycles per unit time. The SI unit is the hertz (Hz). One hertz is one cycle per second. A “cycle” is an event, not a unit, so the dimension of one hertz is s-1.
17 The period, T, of a wave is the time between the passage of two successive crests past a given point. Period is the reciprocal of frequency. f = 1/ T and T = 1/ f
18 The wavelength, l (lambda), is the distance between any particle and the next particle that is in phase with it.