Department of Pre-University Education, Karnataka course PUC Karnataka Science Class 12
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The Energy of a Silver Atom with a Vacancy in K Shell is 25.31 Kev, in L Shell is 3.56 Kev and in M Shell is 0.530 Kev Higher than the Energy of the Atom with No Vacancy. - Physics

ConceptElectromagnetic Spectrum

Question

The energy of a silver atom with a vacancy in K shell is 25.31 keV, in L shell is 3.56 keV and in M shell is 0.530 keV higher than the energy of the atom with no vacancy. Find the frequency of Kα, Kβ and Lα X-rays of silver.

(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)

Solution

Given:-
Energy of electron in the K shell, Ek = 25.31 keV
Energy of electron in the L shell, EL = 3.56 keV
Energy of electron in the M shell, EM = 0.530 keV

Let f be the frequency of Kα X-ray and f0 be the frequency of Kβ X-ray.
Let f1 be the frequency of Lα X-rays of silver.

∴ Kα = EK − EL = hf
Here, h = Planck constant
f = frequency of Kα X-ray

f = (E_K - E_L)/h

f = ((25.31 xx 3.56))/(6.63 xx 10^-34) xx 1.6 xx 10^-19 xx 10^3

f = (21.75 xx 10^3 xx 10^15)/6.67

f = 5.25 xx 10^18  "Hz"

K_β = E_K - E_M = hf_0

⇒ f_0 = (E_K - E_M)/h

⇒ f_0 = ((25.31 - 0.53))/(6.67 xx 10^-34) xx 10^3 xx 1.6 xx 10^-19

⇒ f_0 = 5.985 xx 10^18  "Hz"

K_L = E_L - E_M = hf_1

f_1 = (E_L - E_M)/h

f_1 = (3.56 - 0.530)/(6.63 xx 10^-34) xx 10^3 xx 1.6 xx 10^-19

f_1 = 7.32 xx 10^17  "Hz"

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Solution The Energy of a Silver Atom with a Vacancy in K Shell is 25.31 Kev, in L Shell is 3.56 Kev and in M Shell is 0.530 Kev Higher than the Energy of the Atom with No Vacancy. Concept: Electromagnetic Spectrum.
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