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diff --git a/1172/CH3/EX3.8.1/3_8a.txt b/1172/CH3/EX3.8.1/3_8a.txt
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+++ b/1172/CH3/EX3.8.1/3_8a.txt
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+ # Problem 8a # 
+
+ As the threshold wavelength is less than wavelength of incident radiation 
+ So electron will not be ejected 
diff --git a/1172/CH3/EX3.8.1/Example3_8a.sce b/1172/CH3/EX3.8.1/Example3_8a.sce
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+++ b/1172/CH3/EX3.8.1/Example3_8a.sce
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+clc
+//Given that
+lambda = 4.3e-7 // wavelength of light in meter
+phi_Ni = 5 // work function of nickel in eV
+h = 6.624e-34 // plank's constant
+c = 3e8 // speed of light
+m_e = 9.1e-31 // mass of electron in kg
+//Sample Problem 8a Page No. 138
+printf("\n\n\n # Problem 8a # \n")
+lambda_threshold = h * c / (phi_Ni*1e-19) //calculation of longest wavelength required
+if (lambda_threshold < lambda) then
+    printf("\n As the threshold wavelength is less than wavelength of incident radiation \n So electron will not be ejected \n")
+else 
+    v = sqrt((2* h * c *(lambda - lambda_threshold)) / (m * lambda_threshold * lambda ))) //calculation of ejected velocity Electron
+    printf("\n As the threshold wavelength is greater than wavelength of incident radiation So electron will be ejected with velocity %e. ",v)
+end
+