Question
Electromagnetic radiation having a 15.0 μm15.0 \textrm{ }\mu\textrm{m} wavelength is classified as infrared radiation. What is its frequency?
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Final Answer

2.00×1013 Hz2.00 \times 10^{13} \textrm{ Hz}

Solution video

OpenStax College Physics, Chapter 24, Problem 11 (Problems & Exercises)

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Video Transcript
This is College Physics Answers with Shaun Dychko. The wave equation says that the speed of light equals frequency times wavelength and we can solve for f by dividing both sides by Lambda. And so we take the speed of light and divide it by the wavelength of this infrared wavelength. And so that's 3 times 10 to the 8 meters per second divided by 15 micrometers, which is times 10 to the minus 6 meters giving a frequency of 2.00 times 10 to the 13 Hertz.