11 files changed, 192 insertions, 0 deletions

diff --git a/3840/CH4/EX4.1/Ex4_1.sce b/3840/CH4/EX4.1/Ex4_1.sce
new file mode 100644
index 000000000..43e2382b3
--- /dev/null
+++ b/3840/CH4/EX4.1/Ex4_1.sce
@@ -0,0 +1,18 @@
+clear
+//
+//
+//
+
+//Variable declaration
+new=5.6*10**12    //frequency(Hz)
+h=6.625*10**-34   //plank constant
+kB=1.38*10**-23   //boltzmann constant
+T=330             //temperature(K) 
+
+//Calculation
+x=h*new/(kB*T) 
+E=h*new/(exp(x)-1)     //average energy of oscillator(joule)
+
+//Result
+printf("\n average energy of oscillator is %0.3f  *10**-21 joule",E*10**21)
+printf("\n answer given in the book varies due to rounding off errors")
diff --git a/3840/CH4/EX4.10/Ex4_10.sce b/3840/CH4/EX4.10/Ex4_10.sce
new file mode 100644
index 000000000..4033579a9
--- /dev/null
+++ b/3840/CH4/EX4.10/Ex4_10.sce
@@ -0,0 +1,14 @@
+clear
+//
+//
+//
+
+//Variable declaration
+me=9.1*10**-31    //mass(kg)
+h=6.63*10**-34   //plank constant
+mn=1.676*10**-27    //mass(kg)
+
+//Calculation
+lamdan=h*10**9/sqrt(4*mn*me)     //de broglie wavelength(nm)  
+
+//Result
diff --git a/3840/CH4/EX4.11/Ex4_11.sce b/3840/CH4/EX4.11/Ex4_11.sce
new file mode 100644
index 000000000..f6026a98c
--- /dev/null
+++ b/3840/CH4/EX4.11/Ex4_11.sce
@@ -0,0 +1,23 @@
+clear
+//
+//
+//
+
+//Variable declaration
+L=2*10**-10    //length(m)
+n2=2
+n4=4
+m=9.1*10**-31    //mass(kg)
+e=1.6*10**-19    //charge(c)
+h=6.63*10**-34   //plank constant
+
+//Calculation
+E1=h**2/(8*m*e*L**2)    //minimum energy(eV)
+E2=n2**2*E1      //energy of 1st excited state(eV)
+E4=n4**2*E1      //energy of 2nd excited state(eV)
+
+//Result
+printf("\n ground state energy is %0.2f  eV",E1)
+printf("\n energy of 1st excited state is %0.3f  eV",E2)
+printf("\n energy of 2nd excited state is %0.2f  eV",E4)
+printf("\n answers for energy of 1st and 2nd states given in the book are wrong")
diff --git a/3840/CH4/EX4.13/Ex4_13.sce b/3840/CH4/EX4.13/Ex4_13.sce
new file mode 100644
index 000000000..d0b6fe232
--- /dev/null
+++ b/3840/CH4/EX4.13/Ex4_13.sce
@@ -0,0 +1,23 @@
+clear
+//
+//
+//
+
+//Variable declaration
+L=1*10**-10    //length(m)
+n3=3
+m=9.11*10**-31    //mass(kg)
+e=1.6*10**-19    //charge(c)
+h=6.63*10**-34   //plank constant
+
+//Calculation
+E1=h**2/(8*m*e*L**2)    //g state energy(eV)
+
+E3=n3**2*E1      //energy of 2nd excited state(eV)
+E=E3-E1          //energy required to pump an electron(eV) 
+
+//Result
+printf("\n ground state energy is %0.3f  eV",E1)
+printf("\n energy of 2nd excited state is %0.2f  eV",E3)
+printf("\n energy required to pump an electron is %0.2f  eV",E)
+printf("\n answer given in the book is wrong")
diff --git a/3840/CH4/EX4.15/Ex4_15.sce b/3840/CH4/EX4.15/Ex4_15.sce
new file mode 100644
index 000000000..e16157f0f
--- /dev/null
+++ b/3840/CH4/EX4.15/Ex4_15.sce
@@ -0,0 +1,12 @@
+clear
+//
+//
+//
+
+//Variable declaration
+V=1600    //accelerated voltage(V)
+
+//Calculation
+lamda=1.227*10/sqrt(V)    //wavelength of electron waves(angstrom)
+
+//Result
diff --git a/3840/CH4/EX4.2/Ex4_2.sce b/3840/CH4/EX4.2/Ex4_2.sce
new file mode 100644
index 000000000..d1e515d7a
--- /dev/null
+++ b/3840/CH4/EX4.2/Ex4_2.sce
@@ -0,0 +1,19 @@
+clear
+//
+//
+//
+
+//Variable declaration
+h=6.63*10**-34   //plank constant
+kB=1.38*10**-23  //boltzmann constant
+T=1500           //temperature(K) 
+c=3*10**8        //velocity of light(m/sec)
+lamda=6000*10**-10   //wavelength(m)
+
+//Calculation
+new=c/lamda
+x=h*new/(kB*T) 
+y=exp(x)-1     //average energy of oscillator(joule)
+Ulamda=8*%pi*h*new/(y*lamda**4)    //energy density per unit wavelength(Jm-4)
+
+//Result
diff --git a/3840/CH4/EX4.4/Ex4_4.sce b/3840/CH4/EX4.4/Ex4_4.sce
new file mode 100644
index 000000000..446eb9a73
--- /dev/null
+++ b/3840/CH4/EX4.4/Ex4_4.sce
@@ -0,0 +1,16 @@
+clear
+//
+//
+//
+
+//Variable declaration
+lamda=1.66*10**-10    //wavelength(m)
+m=9.1*10**-31    //mass(kg)
+e=1.6*10**-19    //charge(c)
+h=6.63*10**-34   //plank constant
+
+//Calculation
+E=h**2/(2*m*e*lamda**2)   //kinetic energy(eV)
+v=h/(m*lamda)      //velocity(m/s)
+
+//Result
diff --git a/3840/CH4/EX4.5/Ex4_5.sce b/3840/CH4/EX4.5/Ex4_5.sce
new file mode 100644
index 000000000..761485757
--- /dev/null
+++ b/3840/CH4/EX4.5/Ex4_5.sce
@@ -0,0 +1,23 @@
+clear
+//
+//
+//
+
+//Variable declaration
+L=1*10**-10    //length(m)
+n2=2
+n3=3
+m=9.1*10**-31    //mass(kg)
+e=1.6*10**-19    //charge(c)
+h=6.63*10**-34   //plank constant
+
+//Calculation
+E1=h**2/(8*m*e*L**2)    //g state energy(eV)
+
+E2=n2**2*E1      //energy of 1st excited state(eV)
+E3=n3**2*E1      //energy of 2nd excited state(eV)
+
+//Result
+printf("\n ground state energy is %0.4f  eV",E1)
+printf("\n energy of 1st excited state is %0.2f  eV",E2)
+printf("\n energy of 2nd excited state is %0.4f  eV",E3)
diff --git a/3840/CH4/EX4.6/Ex4_6.sce b/3840/CH4/EX4.6/Ex4_6.sce
new file mode 100644
index 000000000..86b53ec5f
--- /dev/null
+++ b/3840/CH4/EX4.6/Ex4_6.sce
@@ -0,0 +1,15 @@
+clear
+//
+//
+//
+
+//Variable declaration
+L=4*10**-10    //length(m)
+m=9.1*10**-31    //mass(kg)
+e=1.6*10**-19    //charge(c)
+h=6.63*10**-34   //plank constant
+
+//Calculation
+E1=h**2/(8*m*e*L**2)    //minimum energy(eV)
+
+//Result
diff --git a/3840/CH4/EX4.7/Ex4_7.sce b/3840/CH4/EX4.7/Ex4_7.sce
new file mode 100644
index 000000000..b3889aa91
--- /dev/null
+++ b/3840/CH4/EX4.7/Ex4_7.sce
@@ -0,0 +1,13 @@
+clear
+//
+//
+//
+
+//Variable declaration
+V=15*10**3    //accelerated voltage(V)
+
+//Calculation
+lamda=1.227/sqrt(V)    //wavelength of electron waves(nm)
+
+//Result
+printf("\n wavelength of electron waves is %0.2f  nm",lamda)
diff --git a/3840/CH4/EX4.9/Ex4_9.sce b/3840/CH4/EX4.9/Ex4_9.sce
new file mode 100644
index 000000000..92dd917fe
--- /dev/null
+++ b/3840/CH4/EX4.9/Ex4_9.sce
@@ -0,0 +1,16 @@
+clear
+//
+//
+//
+
+//Variable declaration
+L=3*10**-10    //length(m)
+m=9.1*10**-31    //mass(kg)
+e=1.6*10**-19    //charge(c)
+h=6.63*10**-34   //plank constant
+
+//Calculation
+E1=h**2/(8*m*e*L**2)    //minimum energy(eV)
+
+//Result
+printf("\n minimum energy is %0.1f  eV",E1)