Radiation calculating energy from wavelength

Calculate the energy of electromagnetic radiation, and convert from wavelength to wavenumber and vice versa. 

What energy is associated with a 1H nmr transition The magnitude of this energy may be calculated from the relationship between energy and wavelength (frequency) of the absorbed radiation (Section 9-4). That is,... 

The total irradiance, i.e., the amount of energy per unit time and surface element which reaches the earth s surface as a result of direct sunshine and diffuse celestial radiation in the entire wavelength range of the radiation, is usually measured with a solarimeter. Its sensor consists of one black and one white surface, whose temperature difference it measures. The difference in tempeniture is a measure of the total irradiance E. From E. we can then calculate the total radiant exposure. H = Edt, which strikes the samples during weathering. It is usually stated in MJ m". 

The work function of very pure Na is 2.75 eV, where 1 eV = 1.602 X 10 J. (a) Calculate the maximum kinetic energy of photoelectrons emitted from Na exposed to 200 nm ultraviolet radiation, (b) Calculate the longest wavelength that will cause the photoelectric effect in pure Na. (c) The work function of sodium that has not been very carefully purified is substantially less than 2.75 eV, because of adsorbed sulfur and other substances derived from atmospheric gases. When impure Na is exposed to 200-nm radiation, will the maximum photoelectron kinetic energy be less than or greater than that for pure Na exposed to 200-nm radiation ... 

Using QMOBAS, TMOBAS, or Mathcad and the method from Computer Project 6-2, calculate the energy separation between the HOMO and LUMO in units of p for all compounds in Table 6-1 and enter the results in Table 6-2. Enter the observed energy of ultraviolet radiation absorbed for each compound in units of cm . The reciprocal wavelength is often used as a spectroscopic unit of energy. 

Figure 2, Plots of the efficiencies tje, rjY, rfp, and -qc as a function of the wavelength Xg corresponding to the band gap E. The distributions have been calculated for AM 1.2 solar radiation (taken from distribution T/S of Ref. 6). Curves, E, Y, P, and C are plots of -qEy my VPy rjc as defined in Equations 3,8,12, and 16, respectively. Tfc has been calculated for 0.6, 0.8, and 1.0 eV energy loss, respectively, as...

The energy of an einstein ot radiation of wavelength X (expressed in nm) can be calculated from the simplified expression... 

Atomic orbitals may be combined to form molecular orbitals. In such orbitals, there is a nonzero probability of finding an electron on any of the atoms that contribute to that molecular orbital. Consider an electron that is confined in a molecular orbital that extends over two adjacent carbon atoms. The electron can move freely between the two atoms. The C-C distance is 139 pm. (a) Using the particle in a box model, calculate the energy required to promote an electron from the n = 1 to n = 2 level assuming that the length of the box is equal to the distance between two carbon atoms, (b) To what wavelength of radiation does this correspond (c) Repeat the calculation for a linear chain of 1000 carbon atoms. 

In Table 2 are presented the results of a calculation [6] for the different energy differences 3D-3P one sees that the wavelength of the radiation to match the resonance conditions is around that of a CC>2 laser and that the width r of the lines is 0.437 inn (as deduced from Fig. 1). 

There is a maximum amount of radiant energy emitted by a body at a given absolute temperature T at a wavelength X. This maximum amount of radiant emission is the spectral blackbody radiation intensity Ixb(T) the emitter of such radiation is named a blackbody. This spectral blackbody radiation intensity is independent of direction. For a blackbody at an absolute temperature T and emitting radiative energy into a vacuum, I. b(T) is calculated from the relation given by Planck, 1959 [1], in the form... 

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