Q.The value of Planck's constant is $6.63 \times 10^{-34} \text{ J s}$. The speed of light is $3 \times 10^{17} \text{ nm s}^{-1}$. Which value is closest to the wavelength in nanometers of a quantum of light with frequency $6 \times 10^{15} \text{ s}^{-1}$?