Q.Choose the correct option.
The value of Plank's constant is -

In 1900, Max Planck proposed his quantum theory to explain black-body radiation, a phenomenon that treating light purely as a wave could not account for. Planck argued that the energy of electromagnetic radiation depends only on its frequency, not its amplitude, and that this energy can only be emitted or absorbed in discrete packets called quanta — the smallest unit of energy exchangeable in that form. The energy of one quantum of radiation of frequency ν is $E = h\nu$, where h, Planck's constant, has the experimentally-determined value $6.626\times10^{-34}\ \text{J s}$. In 1905, Albert Einstein extended this idea to explain the photoelectric effect — electrons being ejected from a metal surface by sufficiently high-frequency light — by treating electromagnetic radiation as a stream of particle-like photons, each carrying energy hν and having zero rest mass. Planck's quantum theory and Einstein's photon picture together established that light has a genuine particle side, resolving (together with wave phenomena like diffraction) the wave-particle duality of electromagnetic radiation.