Question

A wave is traveling from one medium to another. If the wave is partially transmitted and partially reflected from the boundary, what will happen to the amplitude of the reflected wave?

Answer 1

The amplitude of the reflected wave will always be less than the amplitude of the incident wave.

Answer 2

I myself have many queries related to such conditions (involving partial transmission and partial reflection) but then your answer should be:

The reflected pulse has a smaller amplitude than the incident pulse. The amplitude is representative of the energy carried by a wave. Since the total energy which is carried by the incident pulse is divided two ways at the boundary, the reflected pulse must have less energy than the transmitted pulse. And hence, lesser amplitude than incident wave.