initial commit / add all books

44 files changed, 489 insertions, 0 deletions

diff --git a/1271/CH15/EX15.1/1.txt b/1271/CH15/EX15.1/1.txt
new file mode 100755
index 000000000..bdab25e42
--- /dev/null
+++ b/1271/CH15/EX15.1/1.txt
@@ -0,0 +1,5 @@
+# PROBLEM 1 # 

+Standard formula used 

+ p = (2 * m * E * e)^(1/2) 

+

+ Percentage of uncertainty in momentum is 3.087112.

diff --git a/1271/CH15/EX15.1/example15_1.sce b/1271/CH15/EX15.1/example15_1.sce
new file mode 100755
index 000000000..d53f7a3a1
--- /dev/null
+++ b/1271/CH15/EX15.1/example15_1.sce
@@ -0,0 +1,15 @@
+clc 
+// Given that 
+E = 1000 // energy of electron in eV
+delta_x = 1e-10 // error in position in m
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 1 on page no. 15.24
+printf("\n # PROBLEM 1 # \n")
+printf("Standard formula used \n")
+printf(" p = (2 * m * E * e)^(1/2) \n")
+p = sqrt(2 * m * E * e)
+delta_p = h / (4 * %pi * delta_x)
+P = (delta_p / p) * 100
+printf("\n Percentage of uncertainty in momentum is %f.",P)
diff --git a/1271/CH15/EX15.10/10.txt b/1271/CH15/EX15.10/10.txt
new file mode 100755
index 000000000..7f5b4e146
--- /dev/null
+++ b/1271/CH15/EX15.10/10.txt
@@ -0,0 +1,6 @@
+ # PROBLEM 10 # 

+Standard formula used 

+ del_x*del_p = h/(4*pi) 

+ m = m_0/(1-(v^2/c^2))^1/2 

+

+ Uncertainty in determining the position is 1.920008e-12 m.

diff --git a/1271/CH15/EX15.10/example15_10.sce b/1271/CH15/EX15.10/example15_10.sce
new file mode 100755
index 000000000..64240c193
--- /dev/null
+++ b/1271/CH15/EX15.10/example15_10.sce
@@ -0,0 +1,14 @@
+clc 
+// Given that
+v = 3e7 // speed of electron in m/sec 
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+h = 6.62e-34 // Planck constant in J-sec
+c = 3e8 // speed of light in m/sec
+// Sample Problem 10 on page no. 15.28
+printf("\n # PROBLEM 10 # \n")
+printf("Standard formula used \n")
+printf(" del_x*del_p = h/(4*pi) \n m = m_0/(1-(v^2/c^2))^1/2 \n")
+delta_p = m * v / sqrt(1 - (v/c)^2)
+delta_x = h / (4 * %pi * delta_p)
+printf("\n Uncertainty in determining the position is %e m.",delta_x)
diff --git a/1271/CH15/EX15.11/11.txt b/1271/CH15/EX15.11/11.txt
new file mode 100755
index 000000000..6f36301bc
--- /dev/null
+++ b/1271/CH15/EX15.11/11.txt
@@ -0,0 +1,5 @@
+ # PROBLEM 11 # 

+Standard formula used 

+ del_E*del_t = h/(4*pi) 

+

+ Minimum error in measurement of the energy is 2.107211e-21 J.

diff --git a/1271/CH15/EX15.11/example15_11.sce b/1271/CH15/EX15.11/example15_11.sce
new file mode 100755
index 000000000..21c86c689
--- /dev/null
+++ b/1271/CH15/EX15.11/example15_11.sce
@@ -0,0 +1,10 @@
+clc 
+// Given that
+t = 2.5e-14 // life time of hydrogen atom in exited state in sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 11 on page no. 15.28
+printf("\n # PROBLEM 11 # \n")
+printf("Standard formula used \n")
+printf(" del_E*del_t = h/(4*pi) \n")
+delta_E = h / (4 * %pi * t)
+printf("\n Minimum error in measurement of the energy is %e J.",delta_E)
diff --git a/1271/CH15/EX15.12/12.txt b/1271/CH15/EX15.12/12.txt
new file mode 100755
index 000000000..dedd6f63a
--- /dev/null
+++ b/1271/CH15/EX15.12/12.txt
@@ -0,0 +1,5 @@
+# PROBLEM 12 # 

+Standard formula used 

+ del_E*del_t = h/(4*pi) 

+

+ Minimum uncertainty in frequency is 7.957747e+06 Hz.

diff --git a/1271/CH15/EX15.12/example15_12.sce b/1271/CH15/EX15.12/example15_12.sce
new file mode 100755
index 000000000..783568c12
--- /dev/null
+++ b/1271/CH15/EX15.12/example15_12.sce
@@ -0,0 +1,10 @@
+clc 
+// Given that
+t = 10^-8 // life time of atom in exited state in sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 12 on page no. 15.28
+printf("\n # PROBLEM 12 # \n")
+printf("Standard formula used \n")
+printf(" del_E*del_t = h/(4*pi) \n")
+delta_f = 1 / (4 * %pi * t)
+printf("\n Minimum uncertainty in frequency is %e Hz.",delta_f)
diff --git a/1271/CH15/EX15.13/13.txt b/1271/CH15/EX15.13/13.txt
new file mode 100755
index 000000000..621fa9bbf
--- /dev/null
+++ b/1271/CH15/EX15.13/13.txt
@@ -0,0 +1,5 @@
+ # PROBLEM 13 # 

+Standard formula used 

+ del_x*del_p = h/(4*pi) 

+

+ Ratio of uncertainty in velocity of a proton and an electron is 5.449102e-04. 

diff --git a/1271/CH15/EX15.13/example15_13.sce b/1271/CH15/EX15.13/example15_13.sce
new file mode 100755
index 000000000..d143c250c
--- /dev/null
+++ b/1271/CH15/EX15.13/example15_13.sce
@@ -0,0 +1,16 @@
+clc 
+// Given that
+delta_x = 20e-10 // uncertainty in position in m
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+m_ = 1.67e-27 // mass of proton in kg
+c = 3e8 // speed of light in m/sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 13 on page no. 15.29
+printf("\n # PROBLEM 13 # \n")
+printf("Standard formula used \n")
+printf(" del_x*del_p = h/(4*pi) \n")
+delta_v1 = h / (4 * %pi * m * delta_x)
+delta_v2 = h / (4 * %pi * m_ * delta_x)
+r = delta_v2 / delta_v1
+printf("\n Ratio of uncertainty in velocity of a proton and an electron is %e. ",r)
diff --git a/1271/CH15/EX15.14/14.txt b/1271/CH15/EX15.14/14.txt
new file mode 100755
index 000000000..f9fb1f865
--- /dev/null
+++ b/1271/CH15/EX15.14/14.txt
@@ -0,0 +1,7 @@
+ # PROBLEM 14 # 

+Standard formula used 

+ E = (n^2 * h^2) / (8 * m * L^2)) 

+

+ Energy of electron - 

+ For (n=1) energy is 6.019835e-18 J.

+ For (n=2) energy is 2.407934e-17 J.

diff --git a/1271/CH15/EX15.14/example15_14.sce b/1271/CH15/EX15.14/example15_14.sce
new file mode 100755
index 000000000..cb6232c50
--- /dev/null
+++ b/1271/CH15/EX15.14/example15_14.sce
@@ -0,0 +1,16 @@
+clc 
+// Given that
+delta_x = 1e-10 // width of box in m
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+c = 3e8 // speed of light in m/sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 14 on page no. 15.29
+printf("\n # PROBLEM 14 # \n")
+printf("Standard formula used \n")
+printf(" E = (n^2 * h^2) / (8 * m * L^2)) \n")
+n = 1 // for n=1
+E = (n^2 * h^2) / (8 * m * delta_x^2)
+n = 2 // for n=2
+E_ = (n^2 * h^2) / (8 * m * delta_x^2)
+printf("\n Energy of electron - \n For (n=1) energy is %e J.\n For (n=2) energy is %e J.",E,E_)
diff --git a/1271/CH15/EX15.15/15.txt b/1271/CH15/EX15.15/15.txt
new file mode 100755
index 000000000..bb880f3ef
--- /dev/null
+++ b/1271/CH15/EX15.15/15.txt
@@ -0,0 +1,5 @@
+ # PROBLEM 15 # 

+Standard formula used 

+ E = (n^2 * h^2) / (8 * m * L^2)) 

+

+ Energy difference is 1.805951e-17 J.

diff --git a/1271/CH15/EX15.15/example15_15.sce b/1271/CH15/EX15.15/example15_15.sce
new file mode 100755
index 000000000..9746207c0
--- /dev/null
+++ b/1271/CH15/EX15.15/example15_15.sce
@@ -0,0 +1,17 @@
+clc 
+// Given that
+l = 1e-10 // width of box in m
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+c = 3e8 // speed of light in m/sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 15 on page no. 15.30
+printf("\n # PROBLEM 15 # \n")
+printf("Standard formula used \n")
+printf(" E = (n^2 * h^2) / (8 * m * L^2)) \n")
+n = 1 // for n=1
+E = (n^2 * h^2) / (8 * m * l^2)
+n = 2 // for n=2
+E_ = (n^2 * h^2) / (8 * m * l^2)
+d = E_ - E
+printf("\n Energy difference is %e J.",d)
diff --git a/1271/CH15/EX15.16/16.txt b/1271/CH15/EX15.16/16.txt
new file mode 100755
index 000000000..43d9f5576
--- /dev/null
+++ b/1271/CH15/EX15.16/16.txt
@@ -0,0 +1,8 @@
+ # PROBLEM 16 # 

+Standard Formula used 

+ E = (n^2 * h^2) / (8 * m * L^2)) 

+

+ Energy of electron -

+ For (n=1) is 6.688706e-19 J.

+ For (n=2) is 2.675482e-18 J.

+ For (n=3) is 6.019835e-18 J.

diff --git a/1271/CH15/EX15.16/example15_16.sce b/1271/CH15/EX15.16/example15_16.sce
new file mode 100755
index 000000000..f53857a6d
--- /dev/null
+++ b/1271/CH15/EX15.16/example15_16.sce
@@ -0,0 +1,18 @@
+clc 
+// Given that
+l = 3e-10 // width of box in m
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+c = 3e8 // speed of light in m/sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 16 on page no. 15.30
+printf("\n # PROBLEM 16 # \n")
+printf("Standard Formula used \n")
+printf(" E = (n^2 * h^2) / (8 * m * L^2)) \n")
+n = 1 // For n=1
+E = (n^2 * h^2) / (8 * m * l^2)
+n = 2 // For n=2
+E_ = (n^2 * h^2) / (8 * m * l^2)
+n = 3 // For n=3
+E__ = (n^2 * h^2) / (8 * m * l^2)
+printf("\n Energy of electron -\n For (n=1) is %e J.\n For (n=2) is %e J.\n For (n=3) is %e J.",E,E_,E__)
diff --git a/1271/CH15/EX15.17/17.txt b/1271/CH15/EX15.17/17.txt
new file mode 100755
index 000000000..5382703e1
--- /dev/null
+++ b/1271/CH15/EX15.17/17.txt
@@ -0,0 +1,7 @@
+ # PROBLEM 17 # 

+Standard formula used 

+ E = (n^2 * h^2) / (8 * m * L^2)) 

+

+ Energy of electron -

+ For (n=1) is 9.631736e-19 J.

+ For (n=2) is 3.852695e-18 J.

diff --git a/1271/CH15/EX15.17/example15_17.sce b/1271/CH15/EX15.17/example15_17.sce
new file mode 100755
index 000000000..d431d3aac
--- /dev/null
+++ b/1271/CH15/EX15.17/example15_17.sce
@@ -0,0 +1,16 @@
+clc 
+// Given that
+l = 2.5e-10 // width of box in m
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+c = 3e8 // speed of light in m/sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 17 on page no. 15.30
+printf("\n # PROBLEM 17 # \n")
+printf("Standard formula used \n")
+printf(" E = (n^2 * h^2) / (8 * m * L^2)) \n")
+n = 1 // for n=1
+E = (n^2 * h^2) / (8 * m * l^2)
+n = 2 // for n=2
+E_ = (n^2 * h^2) / (8 * m * l^2)
+printf("\n Energy of electron -\n For (n=1) is %e J.\n For (n=2) is %e J.",E,E_)
diff --git a/1271/CH15/EX15.18/18.txt b/1271/CH15/EX15.18/18.txt
new file mode 100755
index 000000000..20c190a97
--- /dev/null
+++ b/1271/CH15/EX15.18/18.txt
@@ -0,0 +1,5 @@
+# PROBLEM 18 # 

+Standard formula used 

+ E = (n^2 * h^2) / (8 * m * L^2)) 

+

+ Lowest energy of neutron confined in the nucleus is 3.280269e-13 J.

diff --git a/1271/CH15/EX15.18/example15_18.sce b/1271/CH15/EX15.18/example15_18.sce
new file mode 100755
index 000000000..2770faa06
--- /dev/null
+++ b/1271/CH15/EX15.18/example15_18.sce
@@ -0,0 +1,14 @@
+clc 
+// Given that
+l = 1e-14 // width of box in m
+e = 1.6e-19 // charge on an electron in C
+m = 1.67e-27 // mass of neutron in kg
+c = 3e8 // speed of light in m/sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 18 on page no. 15.31
+printf("\n # PROBLEM 18 # \n")
+printf("Standard formula used \n")
+printf(" E = (n^2 * h^2) / (8 * m * L^2)) \n")
+n = 1 // for n=1
+E = (n^2 * h^2) / (8 * m * l^2)
+printf("\n Lowest energy of neutron confined in the nucleus is %e J.",E)
diff --git a/1271/CH15/EX15.19/19.txt b/1271/CH15/EX15.19/19.txt
new file mode 100755
index 000000000..642b1ea4a
--- /dev/null
+++ b/1271/CH15/EX15.19/19.txt
@@ -0,0 +1,11 @@
+ # PROBLEM 19 # 

+Standard formula used 

+ E = (n^2 * h^2) / (8 * m * L^2)) 

+ p_n = n*h/(2*pi) 

+

+ Energy of electron -

+ For (n=1) is 6.019835e-18 J.

+ For (n=2) is 2.407934e-17 J.

+ Momentum of electron -

+ For (n=1) is 3.310000e-24 kg-m/sec.

+ For (n=2) is 6.620000e-24 kg-m/sec.

diff --git a/1271/CH15/EX15.19/example15_19.sce b/1271/CH15/EX15.19/example15_19.sce
new file mode 100755
index 000000000..afab4774e
--- /dev/null
+++ b/1271/CH15/EX15.19/example15_19.sce
@@ -0,0 +1,18 @@
+clc 
+// Given that
+l = 1e-10 // width of box in m
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+c = 3e8 // speed of light in m/sec
+h = 6.63e-34 // Planck constant in J-sec
+// Sample Problem 19 on page no. 15.31
+printf("\n # PROBLEM 19 # \n")
+printf("Standard formula used \n")
+printf(" E = (n^2 * h^2) / (8 * m * L^2)) \n p_n = n*h/(2*pi) \n")
+n = 1 // for n=1
+p1 = (n * h) / (2 * l)
+E = (n^2 * h^2) / (8 * m * l^2)
+n = 2 // for n=2
+p2 = (n * h) / (2 * l)
+E_ = (n^2 * h^2) / (8 * m * l^2)
+printf("\n Energy of electron -\n For (n=1) is %e J.\n For (n=2) is %e J.\n Momentum of electron -\n For (n=1) is %e kg-m/sec.\n For (n=2) is %e kg-m/sec.",E,E_,p1,p2)
diff --git a/1271/CH15/EX15.20/20.txt b/1271/CH15/EX15.20/20.txt
new file mode 100755
index 000000000..ac0a5174f
--- /dev/null
+++ b/1271/CH15/EX15.20/20.txt
@@ -0,0 +1,13 @@
+ # PROBLEM 20 # 

+Standard formula used 

+ E = (n^2 * h^2) / (8 * m * L^2)) 

+ p_n = n*h/(2*pi) 

+

+ Energy Eigen value of electron -

+ For (n=1) is 6.019835e-18 J.

+ For (n=2) is 2.407934e-17 J.

+ For (n=3) is 5.417852e-17 J. 

+de-Broglie wavelength of electron -

+ For (n=1) is 2.000000 A.

+ For (n=2) is 1.000000 A. 

+ For (n=3) is 0.666667 A

diff --git a/1271/CH15/EX15.20/example15_20.sce b/1271/CH15/EX15.20/example15_20.sce
new file mode 100755
index 000000000..a0d7ff454
--- /dev/null
+++ b/1271/CH15/EX15.20/example15_20.sce
@@ -0,0 +1,20 @@
+clc 
+// Given that
+l = 1e-10 // length of box in m
+m = 9.1e-31 // mass of electron in kg
+c = 3e8 // speed of light in m/sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 20 on page no. 15.32
+printf("\n # PROBLEM 20 # \n")
+printf("Standard formula used \n")
+printf(" E = (n^2 * h^2) / (8 * m * L^2)) \n p_n = n*h/(2*pi) \n")
+n = 1 // for n=1
+E1 = (n^2 * h^2) / (8 * m * l^2)
+lambda1 =2*l
+n = 2 // for n=2
+E2 = (n^2 * h^2) / (8 * m * l^2)
+lambda2 =2*l/2
+n = 3 // for n=3
+E3 = (n^2 * h^2) / (8 * m * l^2)
+lambda3 =2*l/3
+printf("\n Energy Eigen value of electron -\n For (n=1) is %e J.\n For (n=2) is %e J.\n For (n=3) is %e J. \nde-Broglie wavelength of electron -\n For (n=1) is %f A.\n For (n=2) is %f A. \n For (n=3) is %f A",E1,E2,E3,lambda1*1e10,lambda2*1e10,lambda3*1e10)
diff --git a/1271/CH15/EX15.21/21.txt b/1271/CH15/EX15.21/21.txt
new file mode 100755
index 000000000..0e700d524
--- /dev/null
+++ b/1271/CH15/EX15.21/21.txt
@@ -0,0 +1,8 @@
+ # PROBLEM 21 # 

+Standard formula used 

+ E = (n^2 * h^2) / (8 * m * L^2)) 

+

+ Energy Eigen values -

+ For (n=2) for 80.000000 eV.

+ For (n=3) is 180.000000 eV.

+ For (n=4) is 320.000000 eV.

diff --git a/1271/CH15/EX15.21/example15_21.sce b/1271/CH15/EX15.21/example15_21.sce
new file mode 100755
index 000000000..bcd2d5560
--- /dev/null
+++ b/1271/CH15/EX15.21/example15_21.sce
@@ -0,0 +1,19 @@
+clc 
+// Given that
+E1 = 3.2e-18 // minimum energy possible for a particle entrapped in a one dimensional box in J
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+c = 3e8 // speed of light in m/sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 21 on page no. 15.32
+printf("\n # PROBLEM 21 # \n")
+printf("Standard formula used \n")
+printf(" E = (n^2 * h^2) / (8 * m * L^2)) \n")
+E1 = E1 / e // in eV
+n = 2 // for n=2
+E2 = n^2 * E1
+n = 3 // for n=3
+E3 = n^2 * E1
+n = 4 // for n=4
+E4 = n^2 * E1
+printf("\n Energy Eigen values -\n For (n=2) for %f eV.\n For (n=3) is %f eV.\n For (n=4) is %f eV.",E2,E3,E4)
diff --git a/1271/CH15/EX15.22/22.txt b/1271/CH15/EX15.22/22.txt
new file mode 100755
index 000000000..2b3140247
--- /dev/null
+++ b/1271/CH15/EX15.22/22.txt
@@ -0,0 +1,8 @@
+
+# PROBLEM 22 # 

+Standard formula used 

+ E = (n^2 * h^2) / (8 * m * L^2)) 

+ p_n = n*h/(2*pi) 

+

+ Order of exited state is 16.

+ Momentum of electron is 1.326216e-23 kg-m/sec. 
\ No newline at end of file
diff --git a/1271/CH15/EX15.22/example15_22.sce b/1271/CH15/EX15.22/example15_22.sce
new file mode 100755
index 000000000..ad7c5b3eb
--- /dev/null
+++ b/1271/CH15/EX15.22/example15_22.sce
@@ -0,0 +1,18 @@
+
+clc 
+// Given that
+l = 4e-10 // width of box in m
+E = 9.664e-17 // energy of electron in J
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+c = 3e8 // speed of light in m/sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 22 on page no. 15.33
+printf("\n # PROBLEM 22 # \n")
+printf("Standard formula used \n")
+printf(" E = (n^2 * h^2) / (8 * m * L^2)) \n p_n = n*h/(2*pi) \n")
+n = 1 // for n=1
+E1 = (n^2 * h^2) / (8 * m * l^2)
+N = sqrt(E / E1)
+p = ((N) * h) / (2 * l)
+printf("\n Order of exited state is %d.\n Momentum of electron is %e kg-m/sec.",N,p)
diff --git a/1271/CH15/EX15.23/23.txt b/1271/CH15/EX15.23/23.txt
new file mode 100755
index 000000000..3f2251d7d
--- /dev/null
+++ b/1271/CH15/EX15.23/23.txt
@@ -0,0 +1,14 @@
+ # PROBLEM 23 # 

+Standard formula used 

+ E = (n^2 * h^2) / (8 * m * L^2)) 

+ p_n = n*h/(2*pi) 

+

+ Energy levels of electron 

+ For (n=1) is 6.019835e-20 J.

+ For (n=2) is 2.407934e-19 J.

+ For (n=3) is 5.417852e-19 J.

+ Energy levels of marble 

+ For (n=1) is 1.369512e-63 J.

+ For (n=2) is 5.478050e-63 J.

+ For (n=3) is 1.232561e-62 J.

+ It is clear that the levels in case of marble are very small and are nearly zero. So it is not possible to measure them experimentally.

diff --git a/1271/CH15/EX15.23/example15_23.sce b/1271/CH15/EX15.23/example15_23.sce
new file mode 100755
index 000000000..81e5fcd9d
--- /dev/null
+++ b/1271/CH15/EX15.23/example15_23.sce
@@ -0,0 +1,25 @@
+clc 
+// Given that
+l = 10e-10 // width of box containing electron in m
+E = 9.664e-17 // energy of electron in J
+M = 0.001 // mass of glass marble in kg
+l_ = 0.2 // width of box containing marble in m
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+c = 3e8 // speed of light in m/sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 23 on page no. 15.33
+printf("\n # PROBLEM 23 # \n")
+printf("Standard formula used \n")
+printf(" E = (n^2 * h^2) / (8 * m * L^2)) \n p_n = n*h/(2*pi) \n")
+// For electron
+n = 1 // for n=1
+E1 = (n^2 * h^2) / (8 * m * l^2)
+E2 = 2^2* E1
+E3 = 3^2 * E1
+// For glass marble
+E1_ = h^2/(8*M*l_^2)
+E2_ = 2^2 * E1_
+E3_ = 3^2 *E1_
+printf("\n Energy levels of electron \n For (n=1) is %e J.\n For (n=2) is %e J.\n For (n=3) is %e J.\n Energy levels of marble \n For (n=1) is %e J.\n For (n=2) is %e J.\n For (n=3) is %e J.",E1,E2,E3,E1_,E2_,E3_)
+printf("\n It is clear that the levels in case of marble are very small and are nearly zero. So it is not possible to measure them experimentally.")
diff --git a/1271/CH15/EX15.3/3.txt b/1271/CH15/EX15.3/3.txt
new file mode 100755
index 000000000..3d9ee8aea
--- /dev/null
+++ b/1271/CH15/EX15.3/3.txt
@@ -0,0 +1,5 @@
+ # PROBLEM 3 # 

+Standard formula used 

+ p = (2 * m * E * e)^(1/2) 

+

+ Percentage of uncertainty in momentum is 2.182918.

diff --git a/1271/CH15/EX15.3/example15_3.sce b/1271/CH15/EX15.3/example15_3.sce
new file mode 100755
index 000000000..92dab807c
--- /dev/null
+++ b/1271/CH15/EX15.3/example15_3.sce
@@ -0,0 +1,15 @@
+clc 
+// Given that 
+E = 500 // energy of electron in eV
+delta_x = 2e-10 // error in position in m
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 3 on page no. 15.25
+printf("\n # PROBLEM 3 # \n")
+printf("Standard formula used \n")
+printf(" p = (2 * m * E * e)^(1/2) \n")
+p = sqrt(2 * m * E * e)
+delta_p = h / (4 * %pi * delta_x)
+P = (delta_p / p) * 100
+printf("\n Percentage of uncertainty in momentum is %f.",P)
diff --git a/1271/CH15/EX15.4/4.txt b/1271/CH15/EX15.4/4.txt
new file mode 100755
index 000000000..ab82b0f62
--- /dev/null
+++ b/1271/CH15/EX15.4/4.txt
@@ -0,0 +1,5 @@
+ # PROBLEM 4 # 

+Standard formula used 

+ del_x*del_p = h/(4*pi) 

+

+ Uncertainty in position is 7.957747 micrometre.

diff --git a/1271/CH15/EX15.4/example15_4.sce b/1271/CH15/EX15.4/example15_4.sce
new file mode 100755
index 000000000..b0ab42559
--- /dev/null
+++ b/1271/CH15/EX15.4/example15_4.sce
@@ -0,0 +1,11 @@
+clc 
+// Given that 
+delta_lambda = 1e-6 // accuracy in wavelength of its one part
+lambda = 1e-10 // wavelength of x-ray in m
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 4 on page no. 15.25
+printf("\n # PROBLEM 4 # \n")
+printf("Standard formula used \n")
+printf(" del_x*del_p = h/(4*pi) \n")
+delta_x = lambda / (4 * %pi * delta_lambda)
+printf("\n Uncertainty in position is %f micrometer.",delta_x*10^6)
diff --git a/1271/CH15/EX15.5/5.txt b/1271/CH15/EX15.5/5.txt
new file mode 100755
index 000000000..445fef638
--- /dev/null
+++ b/1271/CH15/EX15.5/5.txt
@@ -0,0 +1,5 @@
+ # PROBLEM 5 # 

+Standard formula used 

+ del_x*del_p = h/(4*pi) 

+

+ Uncertainty in momentum is 5.268029e-25 kgm/sec.

diff --git a/1271/CH15/EX15.5/example15_5.sce b/1271/CH15/EX15.5/example15_5.sce
new file mode 100755
index 000000000..134e1e527
--- /dev/null
+++ b/1271/CH15/EX15.5/example15_5.sce
@@ -0,0 +1,12 @@
+clc 
+// Given that 
+delta_x = 1e-10 // error in position in m
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 5 on page no. 15.26
+printf("\n # PROBLEM 5 # \n")
+printf("Standard formula used \n")
+printf(" del_x*del_p = h/(4*pi) \n")
+delta_p = h / (4 * %pi * delta_x)
+printf("\n Uncertainty in momentum is %e kg m/sec.",delta_p)
diff --git a/1271/CH15/EX15.6/6.txt b/1271/CH15/EX15.6/6.txt
new file mode 100755
index 000000000..7eff582a9
--- /dev/null
+++ b/1271/CH15/EX15.6/6.txt
@@ -0,0 +1,5 @@
+ # PROBLEM 6 # 

+Standard formula used 

+ del_x*del_p = h/(4*pi) 

+

+ Uncertainty in position is 1.951122 micrometre.

diff --git a/1271/CH15/EX15.6/example15_6.sce b/1271/CH15/EX15.6/example15_6.sce
new file mode 100755
index 000000000..a4b285edf
--- /dev/null
+++ b/1271/CH15/EX15.6/example15_6.sce
@@ -0,0 +1,14 @@
+clc 
+// Given that 
+M = 5.4e-26 // momentum of electron in kg-m/sec
+p = 0.05 // percentage accuracy in momentum
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 6 on page no. 15.26
+printf("\n # PROBLEM 6 # \n")
+printf("Standard formula used \n")
+printf(" del_x*del_p = h/(4*pi) \n")
+delta_m = p * M / 100
+delta_x = h / (4 * %pi * delta_m)
+printf("\n Uncertainty in position is %f micrometre.",delta_x * 10^6)
diff --git a/1271/CH15/EX15.7/7.txt b/1271/CH15/EX15.7/7.txt
new file mode 100755
index 000000000..f358e6371
--- /dev/null
+++ b/1271/CH15/EX15.7/7.txt
@@ -0,0 +1,6 @@
+ # PROBLEM 7 # 

+Standard formula used 

+ del_x*del_p = h/(4*pi) 

+ p = (2 * m * E * e)^(1/2) 

+

+ Minimum energy of electron is 5.428416e-19 J.

diff --git a/1271/CH15/EX15.7/example15_7.sce b/1271/CH15/EX15.7/example15_7.sce
new file mode 100755
index 000000000..d4499a9d6
--- /dev/null
+++ b/1271/CH15/EX15.7/example15_7.sce
@@ -0,0 +1,13 @@
+clc 
+// Given that 
+r = 0.53e-10 // radius of hydrogen atom in m
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 7 on page no. 15.27
+printf("\n # PROBLEM 7 # \n")
+printf("Standard formula used \n")
+printf(" del_x*del_p = h/(4*pi) \n p = (2 * m * E * e)^(1/2) \n")
+delta_M = h / (4 * %pi * r)
+delta_k = delta_M^2 / (2 * m)
+printf("\n Minimum energy of electron is %e J.",delta_k)
diff --git a/1271/CH15/EX15.8/8.txt b/1271/CH15/EX15.8/8.txt
new file mode 100755
index 000000000..e6d469803
--- /dev/null
+++ b/1271/CH15/EX15.8/8.txt
@@ -0,0 +1,5 @@
+ # PROBLEM 8 # 

+Standard formula used 

+ del_x*del_p = h/(4*pi) 

+

+ Uncertainty in determining the position of electron is 3.859362e-04 m.

diff --git a/1271/CH15/EX15.8/example15_8.sce b/1271/CH15/EX15.8/example15_8.sce
new file mode 100755
index 000000000..79950f1af
--- /dev/null
+++ b/1271/CH15/EX15.8/example15_8.sce
@@ -0,0 +1,15 @@
+clc 
+// Given that
+v = 5e3 // speed of electron in m/sec
+a = 0.003 // percentage accuracy in measurement of speed 
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 8 on page no. 15.27
+printf("\n # PROBLEM 8 # \n")
+printf("Standard formula used \n")
+printf(" del_x*del_p = h/(4*pi) \n")
+delta_v = v * a / 100
+delta_p = m * delta_v
+delta_x = h / (4 * %pi * delta_p)
+printf("\n Uncertainty in determining the position of electron is %e m.",delta_x)
diff --git a/1271/CH15/EX15.9/9.txt b/1271/CH15/EX15.9/9.txt
new file mode 100755
index 000000000..b37055ddf
--- /dev/null
+++ b/1271/CH15/EX15.9/9.txt
@@ -0,0 +1,5 @@
+ # PROBLEM 9 # 

+Standard formula used 

+ del_x*del_p = h/(4*pi) 

+

+ Uncertainty in determining the position is 8.771276e-06 m.

diff --git a/1271/CH15/EX15.9/example15_9.sce b/1271/CH15/EX15.9/example15_9.sce
new file mode 100755
index 000000000..19e6d93bc
--- /dev/null
+++ b/1271/CH15/EX15.9/example15_9.sce
@@ -0,0 +1,15 @@
+clc 
+// Given that
+v = 6.6e4 // speed of electron in m/sec
+a = 0.01 // percentage accuracy in measurement of speed 
+e = 1.6e-19 // charge on an electron in C
+m = 9.1e-31 // mass of electron in kg
+h = 6.6e-34 // Planck constant in J-sec
+// Sample Problem 9 on page no. 15.27
+printf("\n # PROBLEM 9 # \n")
+printf("Standard formula used \n")
+printf(" del_x*del_p = h/(4*pi) \n")
+delta_v = v * a / 100
+delta_p = m * delta_v
+delta_x = h / (4 * %pi * delta_p)
+printf("\n Uncertainty in determining the position is %e m.",delta_x)