$f = 2.4 \times 10^{13} \textrm{ Hz, } \lambda = 12\mu\textrm{m}$ Giancoli 6th Edition, Chapter 27, Problem 13(0:56) Chapter 27, Problem 13 is solved. Start My Free Week View sample solution
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Worth pointing out that the book has the wrong answer, they put a - sign in for the exponent on Hz. Of course it is pretty obviously a minor typo but still worth pointing out. Your answer is correct, they have 2.4x10^-13Hz Oops!