A) By bending along the tube
B) In a straight line
C) By undergoing multiple reflections
D) As ultrasonic frequency
Correct Answer: C
Solution :
Sound can get reflected a number of times before reaching us. In multiple reflections of sound waves, they add up and the loudness increases. In a stethoscope, the sound of a patients's heart beat is guided along the tube to the doctor's ears by multiple reflections.
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