initial commit / add all books

6 files changed, 80 insertions, 0 deletions

diff --git a/3875/CH2/EX2.1/2_1.txt b/3875/CH2/EX2.1/2_1.txt
new file mode 100644
index 000000000..0dbba33b7
--- /dev/null
+++ b/3875/CH2/EX2.1/2_1.txt
@@ -0,0 +1 @@
+ Total absorption in hall = 1012.5 m^2 sabine
\ No newline at end of file
diff --git a/3875/CH2/EX2.1/Ex2_1.sce b/3875/CH2/EX2.1/Ex2_1.sce
new file mode 100644
index 000000000..031f10443
--- /dev/null
+++ b/3875/CH2/EX2.1/Ex2_1.sce
@@ -0,0 +1,9 @@
+clc;

+clear;

+V=7500 //volume in m^3

+T=1.2 //time in seconds

+

+//calculations

+A=(0.162*V)/T

+

+mprintf("Total absorption in hall = %0.1f m^2 sabine",A)

diff --git a/3875/CH2/EX2.2/2_2.txt b/3875/CH2/EX2.2/2_2.txt
new file mode 100644
index 000000000..763f9c331
--- /dev/null
+++ b/3875/CH2/EX2.2/2_2.txt
@@ -0,0 +1,2 @@
+Reverbertion time when hall empty = 3.07 s

+Reverbertion time when hall at full capacity = 1.85 s
\ No newline at end of file
diff --git a/3875/CH2/EX2.2/Ex2_2.sce b/3875/CH2/EX2.2/Ex2_2.sce
new file mode 100644
index 000000000..824d5b8c8
--- /dev/null
+++ b/3875/CH2/EX2.2/Ex2_2.sce
@@ -0,0 +1,39 @@
+clc;

+clear;

+V=1500 //volume of hall in m^3

+Area_plastered_wall=112 //in m^2

+Area_woodem_floor=130 //in m^2

+Area_plastered_ceiling=170 //in m^2

+Area_wooden_doors=20 //in m^2

+Area_cushioned_chairs=120 //in m^2

+Area_Audience=120 //in m^2

+

+

+//Coefficient of Absorption (c)

+c_plastered_wall=0.03 

+c_woodem_floor=0.06 

+c_plastered_ceiling=0.04 

+c_wooden_doors=0.06 

+c_cushioned_chairs=0.50 

+c_Audience=0.4367 

+

+

+

+//calcultion 

+Absorption_plastered_wall=Area_plastered_wall*c_plastered_wall //in m^2 sabine

+Absorption_wooden_floor=Area_woodem_floor*c_woodem_floor //in m^2 sabine

+Absorption_plastered_ceiling=Area_plastered_ceiling*c_plastered_ceiling //in m^2 sabine

+Absorption_wooden_doors=Area_wooden_doors*c_wooden_doors //in m^2 sabine

+Absorption_cushioned_chairs=Area_cushioned_chairs*c_cushioned_chairs //in m^2 sabine

+Total_absorption1 = Absorption_plastered_wall+Absorption_wooden_floor+Absorption_plastered_ceiling+Absorption_wooden_doors+Absorption_cushioned_chairs //in m^2 sabine

+

+//Case (i)

+T1=(0.162*V)/Total_absorption1

+

+//case (ii)

+Absorption_Audience=Area_Audience*c_Audience //in m^2 sabine when hall at full capacity 

+Total_absorption2 = Absorption_plastered_wall+Absorption_wooden_floor+Absorption_plastered_ceiling+Absorption_wooden_doors+Absorption_cushioned_chairs+Absorption_Audience //in m^2 sabine

+T2=(0.162*V)/Total_absorption2

+

+mprintf("Reveberation time when hall empty = %1.2f s\n",T1)

+mprintf("Reveberation time when hall at full capacity = %1.2f s",T2) //The answer provided in the textbook is wrong

diff --git a/3875/CH2/EX2.3/2_3.txt b/3875/CH2/EX2.3/2_3.txt
new file mode 100644
index 000000000..641ba8512
--- /dev/null
+++ b/3875/CH2/EX2.3/2_3.txt
@@ -0,0 +1 @@
+ Reverberation time = 1.62 s
\ No newline at end of file
diff --git a/3875/CH2/EX2.3/Ex2_3.sce b/3875/CH2/EX2.3/Ex2_3.sce
new file mode 100644
index 000000000..c05390b85
--- /dev/null
+++ b/3875/CH2/EX2.3/Ex2_3.sce
@@ -0,0 +1,28 @@
+clc;

+clear;

+l=20 //room length in m

+b=15 //room breadth in m

+h=8 //room height in m

+capacity=200 //number of seats in hall

+Absorption_air=0.012 // per m^3

+

+//Coefficient of Absorption (c)

+c_wall=0.09

+c_ceiling=0.04

+c_floor=0.06 //Value given in the sum is wrong which is 0.60

+c_seat=0.64

+

+

+//calcultion

+A1=2*((b*h)+(l*h))*c_wall //in m^2

+A2=(l*b)*c_ceiling //in m^2

+A3=(l*b)*c_floor //in m^2

+A4=(capacity/2)*(1-c_seat) //in m^2

+A5=(capacity/2)*(c_seat) //in m^2

+Volume=l*b*h //in m^3

+A6=Volume*Absorption_air

+T=A1+A2+A3+A4+A5+A6 //Total absorptionin m^2

+T=0.161*(Volume/(T+A6))

+

+mprintf("Reverberation time = %1.2f s",T) //The answer provided in the textbook is wrong.

+