The device that is not based on sound reflection is

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Megaphone

Galton's whistle

Sonar

Stethoscope

answer is B.

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Detailed Solution

The device that is not based on sound reflection is Galton's whistle

Megaphone: Also known as a speaking trumpet, bullhorn, blowhorn, or loudhailer, a megaphone is a portable or hand-held acoustic horn that is used to amplify and direct sound in a specific direction.

Galton's whistle: Used in teaching dogs and domestic cats, a dog whistle is a sort of whistle that generates sound in the ultrasonic region, which most people cannot hear.

Sonar is a method that uses sound propagation to locate a ship, communicate with other boats, or find items on or below the water's surface.

The stethoscope is an acoustic medical tool used for auscultation, or listening to an animal's or person's body's internal sounds.

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