The value of Planck's constant is _________ × 10^-34 Js.

Concept:

Planck’s constant: It is a physical constant that is the quantum of electromagnetic action. It relates the energy carried by a photon to its frequency by, E = hν.

\(\therefore h=\frac{E}{\nu }\)

Hence, the unit of Planck's constant is    

\(h=\frac{Joule}{1/sec}=Joule\cdot sec\)

The unit of Planck's constant is Joule⋅sec and it value is 6.6 × 10^-34 Js.

Where, 

E = energy, 

ν = frequency

h = Planck’s constant.

Explanation:

From the above explanation, we can see that, Planck's constant is a fundament constant used to define quantum energy.

And its value is approximately 6.6 × 10-34 Js.

Hence option 3 is correct among all