Cameroon GCE advanced level June 2025 physics 2
Cameroon GCE advanced level June 2025 physics 2
SECTION I
(One Hour)
Answer all Questions
1. (a) The specific charge 5 of an ion that is accelerated through a potential difference U into a uniform magnetic field
| B is given by 8 = | where r is the radius of the circular path of the ion in the magnetic field. Show that this |
| equation is homogenous. | |
| (b) All correct equations must be homogeneous but not all homogeneous equations are physically correct. Using a | |
| suitable example explain the meaning of this statement. | ^ marks) |
2. 75 g of steam at 100 C are passed into a quantity of pure melting ice in an insulated calorimeter. If the heat given
out by the steam in condensing to water at 1000 C is just sufficient to melt the ice, calculate the;
(a) mass of the ice
(b) equilibrium temperature of the mixture in the calorimeter. (4 marks)
3. Figure 1 shows how three resistors, three batteries with internal resistances and ammeters are connected in a
network. M
3 0 50
A
9 V 11 V
4 f t
i ft 3 ft
3 V
2 ft
Figure 1
G N G
Calculate the;
i) readings of the meters A, B and C.
ii) potential difference between M and N.
iii) power dissipated as heat in the 5 Cl resistor (8 marks)
4. Figure 2 shows a cylindrical container holding a sample of an ideal gas of molar mass 0.024 kg at a pressure of
1.40 xlO5 N m~2 and temperature of 78 °C.
7.2 cm
Figure 2 J 1
4 *
| 2.5 cm|
(a) i) What mass of gas is present in the container?
ii) How many molecules of the gas are present in the container?
(b) Calculate the average kinetic energy of the gas molecules.
State two experimental results of the photoelectric effect which cannot be explained by the classical wave
theory and explain them using the quantum theory.
The ionisation energy of mercury is 10.4 eV. Calculate the maximum wavelength required by incident
radiation to emit an electron from a mercury atom.
5. i)
ii)
(6 marks)
ANSWER EITHER QUESTION 6 (a), (b) and (c) OR (d), (e) and (f).
Either 6 (a), (b) and (c)
(a) i) State Newton’s law of universal gravitation. (2 marks)
Describe an experiment to measure the acceleration due to gravity near the earth’s surface
Your description should include a diagram, procedure, precaution, observation and conclusion.
ii)
(8 marks)
Sketch a graph to show the variation of gravitational field strength, g, with distance, r, from the center of a
spherical uniformly dense planet of radius RQ.
(b) i)
(3 marks)
| ii) | Explain the shape of the above graph when r > Ro. | (1 mark) |
| (c) Figure 3 shows water flowing horizontally from a hose of diameter 5.0 cm with a speed of 12.0 m s‘1 on to | ||
| a vertical wall. | ||
| Hose | £1 | Wall |
1
I
T
Water
Figure 3
i) Calculate the mass of water hitting the wall each second.
ii) If the water comes to rest on the wall, determine the force exerted by the water on the wall
