Statement I:In a progressive logitudinal wave, the amplitude of the wave will not be the same at all points of the medium along the direction of motion of the wave.
Statement II: there is a continuous change of the phase angle of the wave as it progressive in the direction of motion.

Options

A. Statement I is true, statement II is true and statement II is the correct explaination for statement I.
B. Statement I is true, statement II is true and statement II is NOT the correct explaination for statement I.
C. Statement I is true, statement II is false.
D. Statement I is false, statement II is true.

Explanation

To analyze the statements provided in the question, we will evaluate each statement regarding progressive longitudinal waves.

### Step-by-Step Solution:

1. **Understanding Statement I**:
- Statement I claims that in a progressive longitudinal wave, the amplitude of the wave will not be the same at all points of the medium along the direction of motion of the wave.
- In a progressive wave, the amplitude is defined as the maximum displacement from the mean position. For a longitudinal wave, the amplitude remains constant throughout the medium as the wave travels. Therefore, this statement is **false**.

2. **Understanding Statement II**:
- Statement II states that there is a continuous change of the phase angle of the wave as it progresses in the direction of motion.
- In a progressive wave, as the wave travels through the medium, each point in the medium experiences a change in phase over time. The phase angle varies continuously as the wave moves, which is a characteristic of progressive waves. Therefore, this statement is **true**.

3. **Conclusion**:
- Since Statement I is false and Statement II is true, we can conclude that the overall evaluation of the statements is:
- Statement I: False
- Statement II: True

### Final Answer:
- Statement I is false, and Statement II is true.