If c is the velocity of electromagnetic radiation, e is the charge of an electron, m is the mass of an electron and h is the Planck's constant, then the combination of these universal constants t

Question

If c is the velocity of electromagnetic radiation, e is the charge of an electron, m is the mass of an electron and h is the Planck's constant, then the combination of these universal constants that is dimensionless, is

TestHub · Accepted Answer

[ m ] = M , [ c ] = L T − 1 , [ h ] = M L 2 T − 1 , [ e ] = I T The three combinations have dimensions I 2 T 3 L − 3 , L 3 T − 3 I − 1 and T − 1 None is dimensionless in SI.

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