Physics - Wave on String Question with Solution | TestHub

Statement-1: When a transverse wave travels from a denser medium to a rarer medium (e.g., from a heavier string to a lighter string), the reflection occurs at a free end equivalent. In this case, the reflected wave undergoes no phase change (0 radians). A phase change of $\pi$ radians occurs when reflecting from a rarer to a denser medium (fixed end equivalent). So, Statement-1 is false.

Statement-2: The speed of a wave on a string is $v=\sqrt{T/\mu }$. A denser medium implies a larger linear mass density ($\mu$). If tension $T$ is constant, a larger $\mu$ leads to a smaller wave speed $v$. Thus, the speed of a wave decreases when it enters a denser medium from a rarer medium. So, Statement-2 is true.