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A wavenumber remains any characteristic regarding the electromagnetic radiation and obtained by inversing a wavelength. Wavenumbers are commonly employed in spectroscopy also traditional expressed with inverse centimeters (cm^-1). Wavenumbers can be worked out not only from wavelength but likewise out of the mild energy or frequency of radiation.

Difficulty: Moderately Effortless

Directions

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2 Divide the wavenumber value in m^-1 by 100 to obtain it in inverse centimeters. Wavenumber=18182 m^-1/100=181.82 cm^-1.

3 Using the links in assets obtain the values of the fundamental physical continueds (speed of light and Planck constants) . Pace regarding soft (c) =299,792,458 m/s. Planck constant (h) =4.13566733E'15 eV s (1E-15 denotes "ten in power -15").

4 Divide energy by the product regarding the real constants (Stage 3) work out the wavenumber. Wavenumber (in m^-1)= Energy/h x c= Energy/ 299,792,458 m/s x 4.13566733E'15 eV s/ = Vitality/1.23984187E-6. Note that is energy has to be expressed in "electron volt (eV)" units. Example: if energy is 0.25 eV then Wavenumber=0.25/1.23984187E-6=201638 m^-1 or 2016.38 cm^-1 (see Step 2).

5 Divide frequency through the speed of mild to acquire the wavenumber. wavenumber (m^-1)= frequency/c = frequency (Hz)/299,792,458 (m/s). Observe that frequency is measured on Hertz (Hz). As example, calculate the wavenumber for the frequency of 5E13 Hz. Wavenumber=5E13 Hz/299,792,458 (m/s)=166782 m^-1=1667.82 cm^-1.

References

"Physics"; M. Alonso and E. Finn; June 1992.

Resources

Velocity of light Planck continued

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