"\\lambda = \\frac{c}{\\nu}"
where "\\lambda" - wavelength of photon, "m" ,
"c" - speed of light, "c \\approx 3 \\cdot 10^{8} \\; m \\cdot s^{-1}",
"\\nu" - frequency of photon, "s^{-1}".
"\\lambda = \\frac{3 \\cdot 10^{8}}{6.85 \\cdot 10^{16}} \\approx 4.38 \\cdot 10^{-9} \\; m = 4.38 \\; nm"
Answer: 4.38 nm.
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