Give two difference between progressive wave and stationary wave.

Answer

To answer the question regarding the differences between progressive waves and stationary waves, we can break down the explanation into two main points:

### Step-by-Step Solution:

1. **Definition of Progressive Waves**:
- Progressive waves are waves in which the disturbance moves through the medium. This means that energy is transmitted from one point to another as the wave travels.

2. **Definition of Stationary Waves**:
- Stationary waves, also known as standing waves, are formed when two waves of the same frequency and amplitude travel in opposite directions and interfere with each other. In stationary waves, the disturbance does not move through the medium; instead, it oscillates in place.

3. **First Difference - Movement of Disturbance**:
- In progressive waves, the disturbance moves continuously through the medium. For example, when a wave travels along a string, each particle of the string moves up and down as the wave passes.
- In stationary waves, there is no net movement of disturbance. The particles of the medium oscillate about their equilibrium positions but do not travel along the medium. The wave appears to be "standing still."

4. **Second Difference - Energy Flow**:
- Progressive waves carry energy from one location to another. This energy transfer is a key characteristic of progressive waves, as they can do work on objects they encounter.
- In contrast, stationary waves do not carry energy through the medium. The energy is stored in the oscillations of the particles, but there is no net transfer of energy from one point to another.

### Summary of Differences:
- **Movement of Disturbance**:
- Progressive Waves: Disturbance moves through the medium.
- Stationary Waves: No movement of disturbance; oscillations occur in place.

- **Energy Flow**:
- Progressive Waves: Energy flows with the wave.
- Stationary Waves: No energy flow; energy is stored in the oscillations.