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A B, C, and D are four different physical quantities having different dimensions. None of them is dimensionless. But we know that the equation AD=C in (BD) holds true. Then which of the combination is not meaningful. a) A (square)-B (square) x C (square). b) (A\B) -C c) (A-C)\D


siddheshbahalefamily 16th May, 2020
Answer (1)
ginnisachdeva02_9364270 Student Expert 16th May, 2020

Hey!

See, as given in question no quantity is dimensionless, but ln(BD) is a dimension less quantity as natural log has no dimensions.

Which means [A] [D] =[C]

And after checking a the options, we can conclude that c option that is (A-C) /D is not a meaningful quantity as A and C has different dimensions, thus can't be subtracted from each other.

Hope it helped to clear your delimma.

Thank you

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