Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

What is the energy of a photon with a wavelength of 58.4 nm in kilojoules/mole?

Interpretation Introduction


The energy of photon with the given wavelength of 58.4nm in kJ/mol has to be determined.

Concept Introduction:

Photoelectron spectroscopy: This is to energy measurement of electrons emitted from solids, gases or liquids by the photoelectric effect, in order to determine the binding energies of electrons in a substance.   

The energy E of electromagnetic radiation is directly proportional to the frequency ν of the radiation.



Where, E is the energy, h is the Plank’s constant (6.626×1034Js), ν is the frequency of radiation, c is the velocity of light and λ is the wavelength of the radiation.



The Helium (He) gas is the most common UV radiation source used for the photoelectron spectroscopy of molecules.  When electrical excited, He atoms emit nearly monochromic radiation at a wavelength of 58.4 nm.

The given photon has the wavelength of 58.4nm=58.4×10-9m thus the energy of corresponding photon can be determined as follows,


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