Q. Stethoscope works on which principle?
Answer: Reflection of sound
Notes: The stethoscope is an acoustic medical device listening to the internal sounds of an animal or human body. It typically has a small disc-shaped resonator that is placed against the chest, and two tubes connected to earpieces. Working of a stethoscope is based on reflection of sound. In a stethoscope, the sound of the patient’s heartbeat reaches the doctor’s ear by multiple reflections of sound.