The unit of Planck's constant is

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(D) Planck's constant $(h)$ relates the energy of a photon $(E)$ to its frequency $(
u)$ by the equation $E = h
u$.Rearranging for $h$,we get $h = E

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Joule-s

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(D) Planck's constant $(h)$ relates the energy of a photon $(E)$ to its frequency $(
u)$ by the equation $E = h
u$.Rearranging for $h$,we get $h = E / 
u$.The unit of energy $(E)$ is Joule $(J)$ and the unit of frequency $(
u)$ is Hertz $(Hz)$,which is equivalent to $s^{-1}$.Therefore,the unit of $h$ is $J / s^{-1} = J \cdot s$ (Joule-second).

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