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Which is different from others by units?

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Which is different from others by units?

(a) Phase difference

(b) Mechanical equivalent

(c) Loudness of sound

(d) Poisson’s ratio

This question was posed to me by my school principal while I was bunking the class.

Enquiry is from Superposition of Waves in portion Waves of Engineering Physics I

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Best answer
Correct option is (d) Poisson’s ratio

Explanation: Of all the given quantities, Poisson’s ratio has no units.

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