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Answer» Progressive and stationary waves : | Progressive waves | Stationary waves | | 1. They are produced when a disturbance is created in the medium. | 1. They are produced due to interference, under certain conditions, between two identical progressive waves travelling in opposite directions. | | 2. They continuously travel away from the source and transport energy through the medium. | 2. They do not move in any direction and hence do not transport energy through the medium. | | 3. Every particle vibrates with the same amplitude. | 3. Amplitude of vibration is different for different particles | | 4. Phase changes from particle to particle | 4. All the particles in the same loop have the same phase, while the particles in adjacent loops are in opposite phase. | | 5. Every particle of the medium is set into vibrations | 5. There are some particles of the medium which do not vibrate at all. |
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