Question

The stethoscope of doctors for finding quality, strength, and frequency of human heartbeat is based on the principle of
$A.$SONAR
$B.$Reverberation
$C.$ Multiple Reflection
$D.$Echo

Answer 1

The medical instrument that a doctor uses to listen to the sounds produced in the body, mainly in the heart or lung is called a Stethoscope. A stethoscope receives sound from the body and transfers it to the earpieces. In medical fields sound produced by the organ is used to diagnose the working.

Complete step-by-step solution:
We know that Stethoscope is a medical instrument, which is used in the medical field to listen to the sounds produced by the organs (mainly the heart or lung) of the body. A stethoscope receives sounds from the heart and transfers it to the earpieces with the help of the long tubes by a number of reflections of the sound. Working with a Stethoscope is based on the principle of multiple reflections.
Therefore, we can say that The Stethoscope of doctors for finding quality, strength, and frequency of human heartbeat is based on the principle of Multiple Reflection.
Hence, option $(C)$ is the correct one.

Additional Information:
We should also know about Multiple Reflection in brief. One can define Multiple Reflection as the condition of reflection when sound is reflected more than once. During reflection sound, waves obey laws of reflection. Many instruments are based on multiple reflections, some of them are Stethoscope, Trumpet, Megaphone, Soundboard, etc.

Note: First thing which must be kept in mind is the difference between multiple reflection and reverberation. Multiple reflections are just a condition of reflection when sound is reflected more than once while reverberation is defined as the repeated reflection that results in the persistence of sound. One should also not get confused between echo and multiple reflections. The repetition of sound produced by the reflection is called echo.