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If you have a strong infrared absorbance at 1500 cm-1. what is the wavelength of its frequency?
Wiki User
∙ 14y ago
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Daphne Dooley
Wiki User
∙ 14y agoPhotons can be absorbed by different elements. The photon frequency (or wavelength) each element can absorb is very specific. Frequency and wavelength are related by L=c/f and f=c/L where L is wavelength, f is frequency, and c is the speed of light in a vacuum. As frequency goes up, wavelength goes down. In SI units (Système international), wavelength is measured of m (or in this case cm), frequency is measured in Hz, or cycles/second, and c is 299,792,458 m/s.
First the wavelength of infrared absorbance needs to be put into the same units as c (or the other way around). 1/1,500 cm = 1/150,000 m. Plugging into the equations above, a wavelength of 1/1,500 cm has a frequency of f=c/(1/150,000)=44,968,868,700,000 Hz, 44.969e12 Hz, or 44.969 THz (terahertz).
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