The Wavelength Changes
* If Medium 2 is denser: The wavelength decreases.
* If Medium 2 is less dense: The wavelength increases.
The Reason:
The speed of a wave is determined by the properties of the medium it's traveling through. Here's a breakdown:
* Denser medium: The particles in a denser medium are closer together, making it more difficult for the wave to travel. This slows the wave down.
* Less dense medium: The particles are further apart, allowing the wave to travel more easily and faster.
Important Relationship:
The frequency (number of waves passing a point per second) of a wave remains constant as it transitions between media. Since the speed of the wave changes, and frequency stays the same, the wavelength has to adjust accordingly.
The Formula:
The relationship between wavelength (λ), frequency (f), and speed (v) of a wave is:
v = fλ
* If the speed decreases (going into a denser medium), the wavelength must decrease to maintain the same frequency.
* If the speed increases (going into a less dense medium), the wavelength must increase to maintain the same frequency.
Example:
* Light entering water: Water is denser than air. The speed of light slows down in water, causing the wavelength of light to decrease. This is why objects appear to be slightly shifted when viewed underwater.
In Summary:
The wavelength of a wave changes when it enters a different medium due to the change in the wave's speed. The frequency of the wave remains constant.
