Stethoscope Working Principle

A stethoscope functions by utilizing the principle of multiple reflection of sound. Sound waves originating from internal body sources, like the heart or lungs, are picked up by the stethoscope's chest piece.

These sound waves travel through the hollow tubing. Within the tubing and between the chest piece and the earpieces, the sound waves undergo repeated reflections. This phenomenon of multiple reflection guides the sound efficiently towards the listener's ears, amplifying faint sounds and making them audible.

The other principles listed are not the primary working mechanism:

• Dispersion involves splitting of waves based on frequency.
• Diffraction is the bending of waves around obstacles.
• Refraction is the bending of waves due to a change in medium.

Therefore, the core principle is the multiple reflection of sound.