Unformatted text preview: 11 Hz) = ϖ = 3.77x10 12 rad/s . This is an infrared wave. 2. A certain electromagnetic wave has a frequency of 4.00x10 18 Hz . What is its wavelength, wave number, angular frequency, and what kind of wave is it, that is, radio wave, infrared, or what? The wavelength is given by λ = c / f = 3.00x10 8 m/s / (4.00x10 18 Hz) = λ = 7.50x1011 m . The wave number is given by k = 2 π / λ = 2 π / (7.50x1011 m) = k = 8.38x10 10 m1 . The angular frequency is given by ϖ = 2 π f = 2 π (4.00x10 18 Hz) = ϖ = 2.51x10 19 rad/s . This is an Xray....
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 Fall '11
 JimGuinn
 Frequency, Electromagnetic spectrum, 4m, Angular frequency

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