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Q. The dimensional formula of Planck's constant is

AIIMSAIIMS 1997Physical World, Units and Measurements

Solution:

Planck’s constant (h) = $\frac{\text{Energy in each photon}}{\text{Frequency of radiation}} $
$=\frac{\left[E\right]}{\left[v\right]} =\frac{\left[ML^{2}T^{-2}\right]}{\left[T^{-1}\right]}$
$=\left[ML^{2}T^{-1}\right]$