Boundary Behavior of Waves and Polarization Practice Test

A transverse wave on a string enters a second string where the wave speed decreases from $4.0\ \text{m/s}$ to $2.0\ \text{m/s}$ at a knot. The source frequency stays constant. Which statement best describes the transmitted wave on the second string?

A transverse wave on a string passes from a light string into a heavier string. At the boundary, the wave speed decreases. Which statement best describes the transmitted wave in the heavier string?