Distinguish between progressive and stationary waves

(ii)  Vibrations  have the same amplitudes and frequency

(iii) Phases of vibrations changes for different points along the wave

(iv)  Particles in phase are nλ apart where n = 1,2,3 …….

(ii)  Amplitudes are different and depend on position along the wave

(iii)Some points are permanently fixed

(iv)  Particles at distance  apart are in phase