If the mass of the electron (9xx10^(-31)...

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)m)` as unit of length and 500 newton as the unit of force, then the unit of time in the new system would be

A

`3 xx 10^(-22) s`

B

`15 xx 10^(-12) s`

C

`15 xx 10^(-20 ) ` S

D

`45 xx 10^(-20)` S

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The correct Answer is:

A

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