The orbital electrons of an atom can be ejected by exposure to a beam of electro

Question

The orbital electrons of an atom can be ejected by exposure to a beam of electromagnetic radiation. Specifically, an electron can be ejected by a photon with energy greater than or equal to the electron's binding energy. A photon's energy (E) is equal to hc/, where h is Planck’s constant, c is the speed of light, and is the wavelength.

Calculate the maximum wavelength of radiation (corresponding to the minimum energy) necessary to eject a 1s electron from a 79Se atom (which has a1s binding energy of 1.2658×104 eV).

Explanation / Answer

E= hc/

c=3*108 m/sec

Binding energy= 1.2658*104 eV= 1.2658*104*1.6*10-19 joules=2.025*10-15joules

h= plancks constant =6.627*10-34 j.s

= hc/E= 6.627*10-34* 3*108/ 2.025*10-15 =9.81*10-11m

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