**Category:** Acoustics (part of Wave Physics)

**Subtype:** Sound Intensity and Decibels

**Problem Description:** This problem involves a sound source emitting sound in a medium and the intensity of sound heard by a listener as both the source and the listener move. The goal is to determine the maximum sound intensity level (in decibels) that the listener can hear as they both move while maintaining a specific distance relationship. 

**Key Concepts:** 
- Understanding sound intensity levels measured in decibels (dB).
- The relationship between distance from a sound source and sound intensity.
- The inverse square law of sound propagation, which states that sound intensity decreases with the square of the distance from the source.

**Objective:** Find the maximum sound intensity level (in dB) that the listener hears during the movement.