Question

Which of the following device does not work on the multiple reflections of sound waves?

• A. stethoscope
• B. soundboard
• C. megaphone
• D. hydrophone

Answer 1

Answer: (D)

The correct option is B hydrophone
Stethoscope is a medical diagnostic instrument based on multiple reflection of sound waves.
This is used by doctors for listening to the sounds produced inside the body.
Sound board is a concave rigid surface which is placed behind the speaker in a big hall so that his words can be heard clearly even by the people sitting away from the stage.