Laboratory Physics 1 (PHYS2205)
BSc, Physics - PHYS
Semester: Second Semester
Level: 200
Year: 2016
Faculty of science THE UNIVERSITY OF BAMENDA
Department of physics
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:
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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Sketch the graph V as function of I. (5 marks)
3- Determine the value of the unknown resistor R2. (10 marks)
GOOD LUCK.
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