Laboratory Physics 1 (PHYS2205)
BSc, Chemistry - CHMS
Semester: Second Semester
Level: 200
Year: 2016
Faculty of science THE UNIVERSITY OF BAMENDA
Department of chemistry
Second Semester Examination 2015/2016
Course code: PHYS2205 Course title: Laboratory Physics I Time allowed: 3 hrs
Degree Program: Physics and Chemistry Examiner: Dr Zambo and Dr Nana
Session: July 2016 Hall:
Instructions: Answer clearly ALL questions. Use only one graph paper.
Exercise 1( 10 marks)
1- Draw RLC series circuit supplied by an alternative generator, where measurements should be read using an oscilloscope such
that channel I (CH.I) should read voltage across the function generator, and channel II (CH.II) should read the voltage across the
resistor. (10 marks)
Exercise 2 (35 marks)
In the lab, one measures the period T as function of the length L of the pendulum. The data obtained are shown in the
following table:
L(cm) 20 30 40 50 60 70 80 90 100
T(s) 0.897
1.100
1.269
1.418
1.554
1.678
1.794 1.903
2.010
1- Sketch the graph T
2
= y = f(L), (y=T
2
as function of L). (5 marks)
2- Using the least square method, assume that the relation between y=T
2
and L is in the form y-αL+β. Compute α and β. (10
marks)
N.B.: For a couple of points (x, y) related by the relationship y= αx+ β, α and β are defined as:
∝=
∑
.
.
∑
(
)
, = −∝ , =
∑
4- 3- In the same graph paper of question 1, sketch the graph
y = aL+p
obtained from question 2). (5marks) Deduce the
relationship between the period T and the length L. (5 marks)
5- Deduce the value of the acceleration of gravity. (10 marks)
Exercise 3 (25 marks)
1- Draw a circuit supplied by a power supply which helps to determine the unknown resistor R2 which is in parallel with the
resistor Rl=517 Q. (10 marks)
2- By varying the voltage across the power supply, we record in the following table, the voltage V across the unknown resistor
R2, and the current I in the circuit:
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Sketch the graph V as function of I. (5 marks)
3- Determine the value of the unknown resistor R2. (10 marks)
GOOD LUCK.
V(V)
0.32
1.17
2.04
3.04
4.05
4.47
5.29
6.0
7.0
8.0
9.0
I(mA)
0.39
14.1
24.6
37.1
49.0
54.0
64.0
73.0
85.3
96.0
108.0
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