The value of Planck's constant is 6.63 $ \times $ 10^$-$34 J s. The speed of light is 3 $ \times $ 10¹⁷ mm s^$-$1. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 $ \times $ 10¹⁵ s^$-$1 ?