Stethoscope Working Principle: Sound Reflection
A stethoscope is a medical instrument used for listening to internal body sounds, such as heartbeats and breathing.
Core Principle Explained
The working principle of an acoustic stethoscope is fundamentally based on the reflection of sound.
- Sound waves generated within the body travel through the chest piece.
- These waves are directed up the flexible tubing via multiple reflections off the inner surfaces of the tube.
- The sound then travels to the earpieces, allowing the listener to hear the internal body sounds clearly.
Evaluating Other Options
- Option 1 (Conversion to electric signals): This describes electronic stethoscopes, not the basic principle of acoustic ones.
- Option 2 (Conversion to light): Stethoscopes work with sound waves, not light.
- Option 3 (Absorption of high-frequency sound): Stethoscopes aim to transmit sound efficiently, not absorb it.
Therefore, the primary mechanism enabling a stethoscope's function is the reflection of sound waves.
Important Questions from Reflection and Refraction
Which of the following statements is NOT correct about myopia?
Upon sudden exposure to bright light, which muscular structure within the eye actively constricts to limit the amount of light entering the posterior chamber and safeguard the retina?
A ray of light is incident from air on a glass surface. If the reflected and refracted rays are perpendicular to each other when the angle of incidence is $60^\circ$, what is the critical angle for total internal reflection at the glass-air interface?
The ability of the eye to focus on distant objects as well as nearby objects is called
Normal ray, incident ray and reflected ray lie in the-
