In the present paper we suggest an original physical explanatory model that explains the mechanism
of the sound amplification process in a stethoscope. We discuss the amplification of a single pulse,
a continuous wave of certain frequency, and finally we address the resonant frequencies. It is our
belief that this model may provide students with opportunities to not only better understand the
amplification mechanism of a stethoscope, but also to strengthen their understanding of sound,
pressure, waves, resonance modes, etc.