c = f*w or
speed of light = frequency x wavelength
c = 3E8 m/s
f = 8.6E12 hz
w = ? Subsitute the values and solve for wavelength. The value will be given in METERS. Multiply by 10^9 to convert to nm.
Post your work if you get stuck or explain fully what is giving you trouble.
Convert to 8.6*10^13hz to nm
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