Here's why:
* Wave speed is determined by the properties of the medium. For mechanical waves (like sound waves), the speed is primarily determined by the elasticity and density of the medium. These properties are not changing in this scenario.
* Temperature and pressure affect the properties of the medium. If the medium's temperature or pressure changes, it will alter its elasticity and density, leading to a change in wave speed.
Example:
Imagine a stretched string. The speed of a wave traveling along the string depends on the string's tension (elasticity) and mass per unit length (density). If you keep the tension and mass per unit length constant, the wave speed will remain the same, regardless of other factors like the amplitude of the wave.
In summary:
* Constant medium: Wave speed remains constant.
* Changing medium: Wave speed changes.
Let me know if you have any other questions!
