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The characteristic distance at which qua...

The characteristic distance at which quantum gravitational effect are significant the planck length can be determined form a suitable combination of the fundamental physical constant G h and c which of the followng correctly gives the planck length ?

A

`G^(1//2) h^(2)c`

B

`G^(2) h c`

C

`G (h^(2))c^(3)`

D

`((Gh)/(c^(3)))^(1//2)`

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