1.

If the mass of the electron (9xx10^(-31) kg)is taken as unit of mass, the radius of the first Bohr orbit (0.5xx10^(-10))as unit of length and 500 newton as the unit of force, then the unit of time in the new system would be

Answer»

`3 XX 10^(-22) s `
`1.5 xx 10^(-12)s `
`15 xx 10^(-20)s `
`45 xx 10^(-20)s `

Answer :A


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