Application to the Departmental Head
17
September 2018,
The
Departmental Head,
Department
of Physics,
Government
Titumir College,
Mohakhali,
Dhaka 1213.
Subject:
Application seeking permission to use laboratory for developing laboratory
skills.
Dear
Sir,
We
would like to inform you that we are regular students of physics department of
Government Titumir College of session 2013-2014. It would really be helpful for
us to conduct some experiments along with the theories we are studying. Besides we also want to test some of our
ideas with proper guidance of the laboratory coordinator(s). We know that you
are aware enough of the fact that how experiments help the researcher and
thinker and the students as well. It also promotes the thinking power and makes
one skilled. And here we assure you that we will follow all the rules and
regulations of the Laboratory.
Therefore,
we expect and hope that you would consider the case sympathetically and be kind
enough to allow us to use the laboratory and oblige thereby.
Your
most obedient pupil(s),
Fatema
Akter
Roll:
321493
Honours
(Fourth year),
Department
of Physics,
Government
Tirumir College.
AviRatan
Kar
Roll:
321501
Honours
(Fourth Year),
Department
of Physics,
Government
Titumir College.
Enclosure(s):
Results/Reports of some experiments done in our personal laboratory.
Experiment Name: To
determine acceleration due to Gravity using simple pendulum.
Table 1: Acceleration due to Gravity
(Obs. Set 1)
|
Observation No.
|
Required time
for 20 complete cycles
|
Required time
for one complete cycle, T
|
Length of the
String, L
|
Gravitational Acceleration,
g
|
|
1
|
40.75
|
2.0375
|
1
|
9.509693791
|
|
2
|
40.72
|
2.036
|
1
|
9.523711272
|
|
3
|
40.59
|
2.0295
|
1
|
9.584813273
|
|
4
|
40.51
|
2.0255
|
1
|
9.622707234
|
|
5
|
40.37
|
2.0185
|
1
|
9.689564552
|
|
6
|
40.37
|
2.0185
|
1
|
9.689564552
|
|
7
|
40.22
|
2.011
|
1
|
9.761973551
|
|
|
|
|
|
|
|
|
|
|
Total:
|
67.38202823
|
|
|
|
|
Average:
|
9.635833671
|
Table 2: Acceleration due to Gravity
(Obs. Set 2)
|
Observation
No.
|
Required time
for 20 complete cycles
|
Required time
for one complete cycle, T
|
Length of the
String, L
|
Gravitational Acceleration,
g
|
|
1
|
40.42
|
2.021
|
1
|
9.665607176
|
|
2
|
40.27
|
2.0135
|
1
|
9.737747295
|
|
3
|
40.28
|
2.014
|
1
|
9.732912867
|
|
4
|
40.24
|
2.012
|
1
|
9.752272212
|
|
5
|
40.26
|
2.013
|
1
|
9.742585327
|
|
6
|
40.12
|
2.006
|
1
|
9.810698075
|
|
7
|
40.22
|
2.011
|
1
|
9.761973551
|
|
Total:
|
68.2037965
|
|||
|
Average:
|
9.713790364
|
Conclusion: Acceleration due to gravity at 22
57”47.2’ North, 9008”46.4’ East, almost
at sea-level is 9.714 m/s2.
57”47.2’ North, 9008”46.4’ East, almost
at sea-level is 9.714 m/s2.
Remarks: There is a great possibility
that “Required time for 20 complete cycles” wasn’t precise enough to get a very
accurate result.
Experiment Name: To
determine the characteristics curve of an NPN Transistor (BC 547).
Input
characteristics curve for CE configuration:
Table 1: Input characteristics data set of an NPN transistor.
|
Observation No.
|
Base-Emitter
Voltage, VBE (in volt)
|
Base Current,
IB (in µA)
|
|
1
|
0
|
0
|
|
2
|
0.58
|
1
|
|
3
|
0.62
|
3
|
|
4
|
0.63
|
36
|
Input characteristics Graph:
Output
characteristics curve for CE configuration:
Table 2: Output characteristics
data set for an NPN transistor.
|
Observation
No.
|
Collector-Emitter
Voltage, VCE (in volt)
|
Collector
Current, IC (mA)
|
|
1
|
0.01
|
-0.008
|
|
2
|
0.02
|
0.19
|
|
3
|
0.03
|
0.36
|
|
4
|
0.05
|
0.61
|
|
5
|
0.07
|
0.99
|
|
6
|
0.09
|
1.45
|
|
7
|
0.2
|
2.30
|
|
8
|
0.5
|
2.45
|
|
9
|
1.02
|
2.50
|
|
10
|
1.5
|
2.53
|
|
11
|
2.06
|
2.56
|
|
12
|
3
|
2.58
|
|
13
|
4
|
2.60
|
|
14
|
5
|
2.61
|
Output characteristics Graph:
From above charts and graphs,
Remarks: Temperature is an annoying
parameter working with transistor. It could change the whole result.
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