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diff --git a/2459/CH2/EX2.1/Ex2_1.PNG b/2459/CH2/EX2.1/Ex2_1.PNG
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diff --git a/2459/CH2/EX2.1/Ex2_1.sce b/2459/CH2/EX2.1/Ex2_1.sce
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+//chapter 2

+//example 2.1

+//page 29

+ 

+A=60.2d4 // ampere per square m per square kelvin

+T=2500 // kelvin

+phi=4.517 // eV

+d=0.01d-2 // m

+l=5d-2 // m

+

+b=11600*phi

+Js=A*T^2*exp(-b/T)

+a=%pi*d*l

+

+emission_current=Js*a

+

+printf("emission current=%f A",emission_current)

diff --git a/2459/CH2/EX2.2/Ex2_2.PNG b/2459/CH2/EX2.2/Ex2_2.PNG
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diff --git a/2459/CH2/EX2.2/Ex2_2.sce b/2459/CH2/EX2.2/Ex2_2.sce
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+// Chapter 2

+// example 2.2

+// page 29

+Js=0.1 // ampere per square cm

+A=60.2 // ampere per square cm per square kelvin

+T=1900 // kelvin

+

+// Js=A*T^2*exp(-b/T) so b=-T*log(Js/(A*T^2))

+

+b=-T*log(Js/(A*T^2))

+

+// b=11600*phi so making phi as subject

+

+phi=b/11600

+

+printf("work function=%f eV \n",phi) 

+// the accurate answer is 3.521466 

+// but in the book it is mistakenly written as 3.56

+

+if(2.63<phi & phi<4.52)

+     printf("thoriated tungsten has work function between 2.63eV to 4.52eV.\nSo sample is likely to be thoriated tingsten")

+elseif(phi<=2.63 | phi>4.52)

+         printf("tungsten is contaminated")  // for pure tungsten, phi must be 4.52 exactly

+else   

+    printf("tungsten is pure")  // phi=4.52 implies tungsten is pure

+end

+

+// please note that there is error in the answer of work function phi in the book

+// The correct answer is 3.521466 eV and not 3.56 eV