The James Webb Space Telescope

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The James Webb Space Telescope image of Neptune shown above was taken using the NIRCam instrument, which creates images using light with wavelengths between 0.6 and 5 microns. That spans a little bit of yellow and red visible light (0.6 microns to about 0.8 microns) but is mostly “near” infrared (up to 5 microns). What is the frequency of light that has a wavelength of 4.00 microns?