initial commit / add all books

24 files changed, 364 insertions, 0 deletions

diff --git a/2243/CH6/EX6.1/Ex6_1.sce b/2243/CH6/EX6.1/Ex6_1.sce
new file mode 100755
index 000000000..75859cd35
--- /dev/null
+++ b/2243/CH6/EX6.1/Ex6_1.sce
@@ -0,0 +1,44 @@
+//Quantised energy levels for microscopic and macroscopic systems

+clc();

+clear;

+//Given :

+// (a) For a 1s simple pendulum :

+T = 1; // time period in s

+nu = 1/T; //Frequency in Hz

+//Planck's quantisation princple : E_n = n*h*nu

+h = 6.625*10^-34 ; //Planck's constant in Js

+printf("Energy at First three levels for a 1s simple pendulum :\n\n");

+for n1 = 1:3

+    E1 = n1*h*nu ; // Energry  in J

+    printf("E_%d : %1.3f x 10^-34 J\n",n1,E1*10^34);

+end

+// (b) For a hydrogen electron 

+// E_n = (-13.6/n^2)eV

+ printf("Energy at First three levels  for a hydrogen electron :\n\n");

+for n2 = 1:3

+    E2 = (-13.6/n2^2);//Energy in eV

+    printf("E_%d : %.2f J\n",n2,E2);

+end

+

+//Now, for a simple pendulum

+m = 10; // mass in g

+a = 1; // amplitude in cm

+omega = 2*%pi*nu; // angular frequency in rad/s

+// 1 g = 1.0*10^-3 Kg and  1 cm = 1.0*10^-2 m

+E = 1/2*((m*10^-3)*(omega^2)*(a*10^-2)^2); // Energy in J

+//Thus,quantum number n = E/h*nu

+n = E/(h*nu);

+printf("Quantum number n is : %.2f x 10^28 \n\n",n*10^-28);

+//(i)Pendulum :

+//percentage change in energy  = (E_n+1 - E_n)*100/E_n  which is equal to [(n+1)*h*nu - n*h*nu]*100/(n*h*nu )

+//Therefore , it is (1/n) * 100

+pc = (1/n)*100; //percentage change in energy

+printf("Percentage change in energy ( pendulum ) is %1.3f x 10^-27 \n\n",pc*10^27);

+//(ii)Hyderogen electron :

+n_1 = 1; //ground state

+n_2 = 2; // next quantum state

+E_1 = (-13.6/n_1^2); // Energy in eV

+E_2 = (-13.6/n_2^2);//Energy in eV

+//percentage change : |((E_2-E_1)*100)|/ |E_1|

+pc1 =((E_2-E_1)*100)/(-E_1);//percentage change

+printf("Percentage change in energy (hydrogen electron) is  %.1f",abs(pc1));

diff --git a/2243/CH6/EX6.1/Res6_1.txt b/2243/CH6/EX6.1/Res6_1.txt
new file mode 100755
index 000000000..16d3a3535
--- /dev/null
+++ b/2243/CH6/EX6.1/Res6_1.txt
@@ -0,0 +1,15 @@
+Energy at First three levels for a 1s simple pendulum :

+

+E_1 : 6.625 x 10^-34 J

+E_2 : 13.250 x 10^-34 J

+E_3 : 19.875 x 10^-34 J

+Energy at First three levels  for a hydrogen electron :

+

+E_1 : -13.60 J

+E_2 : -3.40 J

+E_3 : -1.51 J

+Quantum number n is : 2.98 x 10^28 

+

+Percentage change in energy ( pendulum ) is 3.356 x 10^-27 

+

+Percentage change in energy (hydrogen electron) is  75.0 
\ No newline at end of file
diff --git a/2243/CH6/EX6.10/Ex6_10.sce b/2243/CH6/EX6.10/Ex6_10.sce
new file mode 100755
index 000000000..c9a34bc03
--- /dev/null
+++ b/2243/CH6/EX6.10/Ex6_10.sce
@@ -0,0 +1,13 @@
+clc();

+clear;

+//Given :

+//(a)Rock

+h = 6.625*10^-34; //planck's constant in Js

+m = 50 ; // mass in g

+v = 40; // Speed in m/s

+// m = 50*10^-3 kg , 1g = 1.0*10^-3 kg

+lambda1 = h/(m*10^-3*v); // Wavelength in m

+//(b)For an electron

+V = 50; // in volts

+lambda2 = 12.28/sqrt(V); // Wavelength in A

+printf("De Broglie wavelength \n\n (a)Rock : %.2f x 10^-34 m \n (b)For an electron : %.2f A",lambda1*10^34,lambda2);

diff --git a/2243/CH6/EX6.10/Res6_10.txt b/2243/CH6/EX6.10/Res6_10.txt
new file mode 100755
index 000000000..c7b2230d5
--- /dev/null
+++ b/2243/CH6/EX6.10/Res6_10.txt
@@ -0,0 +1,4 @@
+De Broglie wavelength 

+

+ (a)Rock : 3.31 x 10^-34 m 

+ (b)For an electron : 1.74 A
\ No newline at end of file
diff --git a/2243/CH6/EX6.14/Ex6_14.sce b/2243/CH6/EX6.14/Ex6_14.sce
new file mode 100755
index 000000000..6539a82dd
--- /dev/null
+++ b/2243/CH6/EX6.14/Ex6_14.sce
@@ -0,0 +1,24 @@
+clc();

+clear;

+//Given:

+//(a) Ball

+h = 6.625*10^-34; //planck's constant in Js

+m1 = 45; //mass in g

+v1 = 40; //Speed in m/s

+prec1 = 1.5/100 ;//precision

+// m1 = 45*10^-3 kg , 1 g = 1.0*10^-3 kg

+p1 =m1*10^-3*v1 ; // momentum in kg m/s

+//(deltap/p)*100 = 1.5

+deltap1 = prec1*p1 ;

+deltax1 = h/deltap1; // uncertainty in position in m

+printf("Uncertainty in  position for a ball : %.2f x 10^-32 m \n",deltax1*10^32);

+//(b) Electron

+m2 = 9.1*10^-31; //electron mass in kg

+v2 = 2*10^6 ; // Speed in m/s

+prec2 = 1.5/100 ; // precision

+p2 = m2*v2; // momentum in kg m/s

+//(deltap/p)*100 = 1.5

+deltap2 = prec2*p2 ;

+deltax2 = h/deltap2; // uncertainty in position in m

+// 1 A  = 1.0*10^-10 m

+printf("Uncertainty in  position for an electron : %.0f A \n",deltax2/(1.0*10^-10));

diff --git a/2243/CH6/EX6.14/Res6_14.txt b/2243/CH6/EX6.14/Res6_14.txt
new file mode 100755
index 000000000..0759f1b6c
--- /dev/null
+++ b/2243/CH6/EX6.14/Res6_14.txt
@@ -0,0 +1,2 @@
+ Uncertainty in  position for a ball : 2.45 x 10^-32 m 

+Uncertainty in  position for an electron : 243 A 
\ No newline at end of file
diff --git a/2243/CH6/EX6.17/Ex6_17.sce b/2243/CH6/EX6.17/Ex6_17.sce
new file mode 100755
index 000000000..e078e8130
--- /dev/null
+++ b/2243/CH6/EX6.17/Ex6_17.sce
@@ -0,0 +1,39 @@
+clc();

+clear;

+//Given:

+//(a) Marble

+h = 6.625*10^-34; //planck's constant in Js

+m1 = 10; // mass in g

+L1 = 10; // width in cm

+// m1 = 10*10^-3 kg , 1 g = 1.0*10^-3 kg  and L1 = 10*10^-2 m , 1 cm = 1.0*10^-2 m

+printf("(a)Marble \n\n");

+for n1 = 1:3

+    En1 = (n1^2*h^2)/(8*m1*10^-3*(L1*10^-2)^2); // Energry  in J

+    printf("E_%d : %.1f x 10^-64 J\n",n1,En1*10^64);

+end

+//(b) For an electron

+m2 = 9.1*10^-31; //electron mass in kg

+L2 = 1 ; // width in A

+//L2 = 1*10^-10 m , 1 A = 1.0*10^-10 m

+printf("(b)For an electron \n\n");

+for n2 = 1:3

+    En2 = (n2^2*h^2)/(8*m2*(L2*10^-10)^2); // Energry  in J

+    printf("E_%d : %.1f eV\n",n2,(En2*6.24150934*10^18)); // 1J = 6.24150934*10^18  eV

+end

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

+

diff --git a/2243/CH6/EX6.17/Res6_17.txt b/2243/CH6/EX6.17/Res6_17.txt
new file mode 100755
index 000000000..b0cb7a851
--- /dev/null
+++ b/2243/CH6/EX6.17/Res6_17.txt
@@ -0,0 +1,10 @@
+ (a)Marble 

+

+E_1 : 5.5 x 10^-64 J

+E_2 : 21.9 x 10^-64 J

+E_3 : 49.4 x 10^-64 J

+(b)For an electron 

+

+E_1 : 37.6 eV

+E_2 : 150.5 eV

+E_3 : 338.7 eV
\ No newline at end of file
diff --git a/2243/CH6/EX6.2/Ex6_2.sce b/2243/CH6/EX6.2/Ex6_2.sce
new file mode 100755
index 000000000..ecb4f479d
--- /dev/null
+++ b/2243/CH6/EX6.2/Ex6_2.sce
@@ -0,0 +1,18 @@
+clc();

+clear;

+//Given :

+h = 6.625*10^-34;//Planck's constant in Js

+c = 3*10^8 ; //velocity of light in m/s

+// 1A = 1.0*10^-10 m

+//(a)Energy of a photon : 

+// E = h*nu or E = h*c/lambda

+printf("Energy of a photon is %2.4f x 10^-16 /lambda(in A)  J\n",((h*c)*10^10)*10^16);

+//1eV = 1.6*10^-19 J

+printf("Energy of a photon is %.0f/lambda(in A)  eV\n\n",round(((h*c)/(1.6*10^-19))*10^10));

+//(b)Visible light Range is 4000-7000 A

+lambda1 = 4000;//Wavelength in A

+lambda2 = 7000;//Wavelength in A

+// 1eV = 1.6*10^-19 J , 

+E1 = (h*c)/(lambda1*10^-10*1.6*10^-19); //Energy in eV

+E2 = (h*c)/(lambda2*10^-10*1.6*10^-19);//Energy in eV

+printf("Hence the range of energies for visible photos is  %.1f eV  to  %.1f eV",E2,E1);

diff --git a/2243/CH6/EX6.2/Res6_2.txt b/2243/CH6/EX6.2/Res6_2.txt
new file mode 100755
index 000000000..c3d97f69d
--- /dev/null
+++ b/2243/CH6/EX6.2/Res6_2.txt
@@ -0,0 +1,4 @@
+Energy of a photon is 19.8750 x 10^-16 /lambda(in A)  J

+Energy of a photon is 12422/lambda(in A)  eV

+

+Hence the range of energies for visible photos is  1.8 eV  to  3.1 eV 
\ No newline at end of file
diff --git a/2243/CH6/EX6.3/Ex6_3.sce b/2243/CH6/EX6.3/Ex6_3.sce
new file mode 100755
index 000000000..86a50aa8d
--- /dev/null
+++ b/2243/CH6/EX6.3/Ex6_3.sce
@@ -0,0 +1,17 @@
+clc();

+clear;

+//Given :

+//Power of the source = 10^-5 W = 10^-5 J/s

+P = 10^-5 ; //Power in J/s

+r = 10^-9; //radius in m

+r1 = 5; // metal plate 5 m away from the source

+WF = 5;//Work function in eV

+area = %pi*(10^-9)^2 ; //area in m^2

+area1 = 4*%pi*r1^2; // area in m^2

+P1 = P*(area/area1); // in J/s

+// 1eV = 1.6*10^-19 J

+t = (WF*1.6*10^-19)/P1 ;// in s

+//1 day = 24 hours * 60 minutes * 60 seconds

+N = t/(24*60*60); //in days

+printf(" It will take %.0f  days \n",round(N));

+

diff --git a/2243/CH6/EX6.3/Res6_3.txt b/2243/CH6/EX6.3/Res6_3.txt
new file mode 100755
index 000000000..ed776e95c
--- /dev/null
+++ b/2243/CH6/EX6.3/Res6_3.txt
@@ -0,0 +1 @@
+ It will take 93  days  
\ No newline at end of file
diff --git a/2243/CH6/EX6.4/Ex6_4.sce b/2243/CH6/EX6.4/Ex6_4.sce
new file mode 100755
index 000000000..eff475425
--- /dev/null
+++ b/2243/CH6/EX6.4/Ex6_4.sce
@@ -0,0 +1,12 @@
+clc();

+clear;

+//Given :

+nu1 = 10*10^14;// Frequency in Hz

+nu2 = 6*10^14;// Frequency in Hz

+V_01 = 2.37; //Stopping potential in volts

+V_02 = 0.72; //Stopping potential in volts

+//Einstein's photoeletric equation : h*nu = phi + e*V_0  

+e = 1.6*10^-19 ;// Charge of an electron in C

+h = (e*(V_02 - V_01))/(nu2 - nu1);//Planck's constant in Js

+phi = ((h*nu1)-(e*V_01))/e ; // work function in eV

+printf("Plancks constant h is %.1f x 10^-34 Js  and Work function phi is %.2f eV ",h*10^34,phi);

diff --git a/2243/CH6/EX6.4/Res6_4.txt b/2243/CH6/EX6.4/Res6_4.txt
new file mode 100755
index 000000000..6e00eb7d1
--- /dev/null
+++ b/2243/CH6/EX6.4/Res6_4.txt
@@ -0,0 +1 @@
+ Plancks constant h is 6.6 x 10^-34 Js  and Work function phi is 1.76 eV 
\ No newline at end of file
diff --git a/2243/CH6/EX6.5/Ex6_5.sce b/2243/CH6/EX6.5/Ex6_5.sce
new file mode 100755
index 000000000..5833aba37
--- /dev/null
+++ b/2243/CH6/EX6.5/Ex6_5.sce
@@ -0,0 +1,20 @@
+clc();

+clear;

+//Given :

+ME = 35*10^3 ; //Maximum energy in eV

+theta = %pi; // photon is backscattered

+h = 6.625*10^-34; //planck's constant in Js

+m0 = 9.1*10^-31; //electron mass in Kg

+c = 3*10^8; //Speed of light in m/s

+deltalambda = (h*(1-cos(theta)))/(m0*c); // in A

+// (h*c/lambda) - (h*c/lambda') = 35 KeV   or  (deltalambda/lambda*lambda1) = (35 KeV/h*c)

+//Simplifying the above Equation , we will obtain : lambda^2 + 0.048 lambda - 0.017

+//Roots of the quadratic equation are :

+values = [-0.017,0.048,1]; // a,b,c values of the quadratic equation

+equation = poly(values,'lamb','coeff'); //quadratic  equation 

+r = roots(equation); //Roots of the final equation

+printf("Incident photon wavelength in Compton scattering is %.2f A",r(2));

+

+

+

+

diff --git a/2243/CH6/EX6.5/Res6_5.txt b/2243/CH6/EX6.5/Res6_5.txt
new file mode 100755
index 000000000..7af7c9af6
--- /dev/null
+++ b/2243/CH6/EX6.5/Res6_5.txt
@@ -0,0 +1 @@
+ Incident photon wavelength in Compton scattering is 0.11 A  
\ No newline at end of file
diff --git a/2243/CH6/EX6.6/Ex6_6.sce b/2243/CH6/EX6.6/Ex6_6.sce
new file mode 100755
index 000000000..90d8ad691
--- /dev/null
+++ b/2243/CH6/EX6.6/Ex6_6.sce
@@ -0,0 +1,26 @@
+clc();

+clear;

+//Given :

+theta = 90; //angle in degrees

+m0 = 9.1*10^-31; //electron mass in kg

+c = 3*10^8; //Speed of light in m/s

+h = 6.625*10^-34; //planck's constant in Js

+deltalambda = ((h*(1-cosd(theta)))/(m0*c))*10^10; // in A

+//(a) Microwave range

+lambda1 = 3.0 ;// wavelength in cm

+//lambda1 = 3.0*10^8 A , 1 cm = 1*10^8 A

+pc1 = ((deltalambda)*100)/((lambda1*10^8) + deltalambda) ;//percent change in photon energy

+printf("Percentage change in energy for radiation in microwave range is : %.0f x 10^-9 \n",pc1*10^9);

+//(b) Visible range

+lambda2 = 5000 ;// wavelength in A

+pc2 = ((deltalambda)/(lambda2 + deltalambda))*100 ;//percent change in photon energy

+printf("Percentage change in energy for radiation in visible range is : %.0f x 10^-4 \n",pc2*10^4);

+//(c) X-ray range

+lambda3 = 1 ; //wavelength in A

+pc3 = ((deltalambda)/(lambda3 + deltalambda))*100 ;//percent change in photon energy

+printf("Percentage change in energy for radiation in X-ray range is : %.1f\n",pc3);

+//(d)Gamma ray range

+lambda4 = 0.012 ;// wavelength in A

+pc4 = ((deltalambda)/(lambda4 + deltalambda))*100 ;//percent change in photon energy

+printf("Percentage change in energy for radiation in Gamma range is : %.1f\n",pc4);

+

diff --git a/2243/CH6/EX6.6/Res6_6.txt b/2243/CH6/EX6.6/Res6_6.txt
new file mode 100755
index 000000000..033429ff6
--- /dev/null
+++ b/2243/CH6/EX6.6/Res6_6.txt
@@ -0,0 +1,5 @@
+ Percentage change in energy for radiation in microwave range is : 8 x 10^-9 

+Percentage change in energy for radiation in visible range is : 5 x 10^-4 

+Percentage change in energy for radiation in X-ray range is : 2.4

+Percentage change in energy for radiation in Gamma range is : 66.9

+ 
\ No newline at end of file
diff --git a/2243/CH6/EX6.7/Ex6_7.sce b/2243/CH6/EX6.7/Ex6_7.sce
new file mode 100755
index 000000000..d3f4e1e26
--- /dev/null
+++ b/2243/CH6/EX6.7/Ex6_7.sce
@@ -0,0 +1,25 @@
+clc();

+clear;

+//Given:

+//Photoelectric effect

+lambda1 = 2000; //wavelength in A

+phi1 = 2.3;// Work function in eV

+m = 9.1*10^-31; //electron mass in kg

+E1 = 12422/lambda1; // Energy of photon in eV

+c = 3*10^8; //Speed of light in m/s

+Ee1 = (12422/lambda1)- phi1; // energy of an electron in eV

+pe1 = sqrt(2*m*Ee1*1.6*10^-19); //electron momentum in kg m/s

+pp1 = (E1*1.6*10^-19)/c ; // Momentum of incident photon in kg m/s

+ratio1 = pe1/pp1 ; // (pe/pp)

+//Compton effect

+lambda2 = 1; // wavelength in A

+deltalambda = 0.048; // Compton shift in A

+E2 = 12422/lambda2; // Energy of photon in eV

+Ee2 = (12422/lambda2)- (12422/(lambda2+deltalambda));//energy of an electron in eV

+pe2 = sqrt(2*m*Ee2*1.6*10^-19); //electron momentum in kg m/s

+pp2 = (E2*1.6*10^-19)/c ; // Momentum of incident photon in kg m/s

+ratio2 = pe2/pp2 ; // (pe/pp)

+printf("Photoelectric effect :\n\n");

+printf("Electron energy : %.1f eV \n Electron momentum  : %.2f x 10^-24 kg m/s \n Momentum of incident photon : %.2f x 10^-27 kg m/s \n pe/pp : %.0f \n\n",Ee1,pe1*10^24,pp1*10^27,ratio1);

+printf("Compton  effect :\n\n");

+printf("Electron energy : %.1f eV \n Electron momentum  : %.1f x 10^-23 kg m/s \n Momentum of incident photon : %.2f x 10^-24 kg m/s \n pe/pp : %.2f \n\n",Ee2,pe2*10^23,pp2*10^24,ratio2);

diff --git a/2243/CH6/EX6.7/Res6_7.txt b/2243/CH6/EX6.7/Res6_7.txt
new file mode 100755
index 000000000..a3eac6746
--- /dev/null
+++ b/2243/CH6/EX6.7/Res6_7.txt
@@ -0,0 +1,15 @@
+ Photoelectric effect :

+

+Electron energy : 3.9 eV 

+ Electron momentum  : 1.07 x 10^-24 kg m/s 

+ Momentum of incident photon : 3.31 x 10^-27 kg m/s 

+ pe/pp : 322 

+

+Compton  effect :

+

+Electron energy : 568.9 eV 

+ Electron momentum  : 1.3 x 10^-23 kg m/s 

+ Momentum of incident photon : 6.63 x 10^-24 kg m/s 

+ pe/pp : 1.94 

+

+ 
\ No newline at end of file
diff --git a/2243/CH6/EX6.8/Ex6_8.sce b/2243/CH6/EX6.8/Ex6_8.sce
new file mode 100755
index 000000000..de3b0140b
--- /dev/null
+++ b/2243/CH6/EX6.8/Ex6_8.sce
@@ -0,0 +1,38 @@
+clc();

+clear;

+//Given:

+//Gamma-rays,X-rays

+lambda1 = 0.01;//Wavelength in A

+c = 3*10^8; //Speed of light in m/s

+E1 =  12422/lambda1; // Energy in A

+p1 = (E1*1.6*10^-19)/c ; //Momentum in kg m/s

+//UV

+lambda2 = 100;//Wavelength in A

+c = 3*10^8; //Speed of light in m/s

+E2 =  12422/lambda2; // Energy in A

+p2 = (E2*1.6*10^-19)/c ; //Momentum in kg m/s

+//IR

+lambda3 = 1*10^-4;//Wavelength in m

+c = 3*10^8; //Speed of light in m/s

+//lambda3 = 1*10^-4*10^10 A , 1 m = 1*10^10 A

+E3 =  12422/(lambda3*10^10); // Energy in A

+p3 = (E3*1.6*10^-19)/c ; //Momentum in kg m/s

+//Microwave

+lambda4 = 1;//Wavelength in m

+c = 3*10^8; //Speed of light in m/s

+//lambda4 = 1*10^10 A , 1 m = 1*10^10 A

+E4 =  12422/(lambda4*10^10); // Energy in A

+p4 = (E4*1.6*10^-19)/c ; //Momentum in kg m/s

+//Radio waves

+lambda5 = 100;//Wavelength in m

+c = 3*10^8; //Speed of light in m/s

+//lambda5 = 100*10^10 A , 1 m = 1*10^10 A

+E5 =  12422/(lambda5*10^10); // Energy in A

+p5 = (E5*1.6*10^-19)/c ; //Momentum in kg m/s

+printf("Gamma-rays,X-rays : \n  Energy : %.2f x 10^6 eV \n Momentum : %.1f x 10^-22 kg m/s \n\n",E1*10^-6,p1*10^22);

+printf(" UV : \n  Energy : %.2f eV \n Momentum : %.1f x 10^-26 kg m/s\n\n",E2,p2*10^26);

+printf(" IR : \n  Energy : %.4f eV \n Momentum : %.1f x 10^-30 kg m/s\n\n",E3,p3*10^30);

+printf(" Microwave : \n  Energy : %.2f x 10^-6 eV \n Momentum : %.1f x 10^-34 kg m/s\n\n",E4*10^6,p4*10^34);

+printf(" Radio waves : \n  Energy : %.2f x 10^-8 eV \n Momentum : %.1f x 10^-36 kg m/s",E5*10^8,p5*10^36);

+

+

diff --git a/2243/CH6/EX6.8/Res6_8.txt b/2243/CH6/EX6.8/Res6_8.txt
new file mode 100755
index 000000000..9af5b01b7
--- /dev/null
+++ b/2243/CH6/EX6.8/Res6_8.txt
@@ -0,0 +1,19 @@
+ Gamma-rays,X-rays : 

+  Energy : 1.24 x 10^6 eV 

+ Momentum : 6.6 x 10^-22 kg m/s 

+

+ UV : 

+  Energy : 124.22 eV 

+ Momentum : 6.6 x 10^-26 kg m/s

+

+ IR : 

+  Energy : 0.0124 eV 

+ Momentum : 6.6 x 10^-30 kg m/s

+

+ Microwave : 

+  Energy : 1.24 x 10^-6 eV 

+ Momentum : 6.6 x 10^-34 kg m/s

+

+ Radio waves : 

+  Energy : 1.24 x 10^-8 eV 

+ Momentum : 6.6 x 10^-36 kg m/s 
\ No newline at end of file
diff --git a/2243/CH6/EX6.9/Ex6_9.sce b/2243/CH6/EX6.9/Ex6_9.sce
new file mode 100755
index 000000000..df8874813
--- /dev/null
+++ b/2243/CH6/EX6.9/Ex6_9.sce
@@ -0,0 +1,10 @@
+clc();

+clear;

+//Given :

+h = 6.625*10^-34; //planck's constant in Js

+m = 9.109*10^-31;// electron mass in kg

+e = 1.6*10^-19; // charge of an electron in C

+//Lambda = h/sqrt(2*m*eV)   here we dont have V , so let us caluclate the remaining part.

+lambda = h/sqrt(2*m*e);// wavelength in A

+// 1 A = 1.0*10^-10 m

+printf("Lambda(A) = %.2f/sqrt(V) ",lambda/(1.0*10^-10));

diff --git a/2243/CH6/EX6.9/Res6_9.txt b/2243/CH6/EX6.9/Res6_9.txt
new file mode 100755
index 000000000..cf4987289
--- /dev/null
+++ b/2243/CH6/EX6.9/Res6_9.txt
@@ -0,0 +1 @@
+ Lambda(A) = 12.27/sqrt(V) 
\ No newline at end of file