Yes! c = nl where c is the speed of light 3.0X108 m/s.

 For l = 400 nm: n = c/l = 3.0X108/400X109 = 7.5X1014 Hz

 For l = 700 nm: n = c/l = 3.0X108/700X109 = 4.3X1014 Hz

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