Question

The dimensional formula of Planck's constant is

• A. $[M{L}^2{T}^{-1}]$
• B. $[M{L}^3{T}^{-1}]$
• C. $[M{L}^{-}2T^{-}1]$
• D. $[M^0{L}^{-}1T^{-}3]$

Answer 1

Answer: (A)

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