1.

If c is the velocity of electromagneticradiation 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

Answer»

`me^(2)//(hc)`
`ch//(me)`
`mc^(2)//H`
none

Solution : `h rarr ML^(2)T^(-1)`
`C rarr LT^(-1)`
`e rarr IT`
`m rarr M`


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