What is the wavelength of EM radiation with the frequency equal to 1.9×10¹⁵ 1/s?

Iwll give extra points to who gets this for ! what type of reaction is this? ?

When balancing a chemical equation:

Consider this equilibrium: n29) + o2(g) + 2no(c).nitrogen gas and oxygen gas react when placed in a closed container. as the reaction proceeds towards equilibrium, what happens to the rate of thereverse reaction?