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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 xx10^(22)` s

B

`15 xx10^(-12)` s

C

`15xx10^(-20)` s

D

`45xx10^(-20)` s

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The correct Answer is:
A
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