The Planck constant $h$ is measured in SI units of $\text{J s}$. Which equation may be used to calculate the Planck constant?
- A$h = \frac{DE}{v}$ where $D$ is distance, $E$ is energy and $v$ is velocity
- B$h = \frac{v}{D}$ where $v$ is velocity and $D$ is distance
- C$h = \frac{1}{4\pi E}$ where $E$ is electric field strength
- D$h = \frac{Fr^2}{m}$ where $F$ is force, $r$ is radius and $m$ is mass