One ofi the combinations from the fundamental physical constants is `(hc)/G`. The unit of this expression is

Options

A. `kg^(2)`
B. `m^(3)`
C. `S^(-1)`
D. m

Answer

A

Explanation

`(hc)/(G) rArr (Js)/(G) rArr(Js ms^(-1))/(Nm^(2)kg^(-2))`
J can also be written as, Nm
`therefore ("Nms ms"^(-1))/(Nm^(2)kg^(-2))=kg^(2)`