cameroon gce A level June 2023 physics 2

SECTION I
(One hour 30 minutes)
Answer all Question
Explain what makes an equation relating physical quantities to be:
homogeneous.
physically correct.
The thermoelectric emf, E generated in a thermocouple when the cold junction is placed in contact with
melting ice and the hot junction placed in a bowl of water at a temperature, 0 is given by the equation
E = Eo( l + a0 + pO2 + …)
Where E0 is the emf at 9 = 0 °C and a and p are constants.
The above equation is homogeneous. Determine the base units of
a9 and P92
a and p.
1.

The volume of a gas changes from 1.80 x 10’6 m3 to 3.20 x 10’3 m3 as it expands adiabatically against the
atmosphere which exerts a pressure of 1.10 xlO5 Pa.
(a) Calculate the total work done by the gas
(b) (i) State and explain how the temperature of the gas changes in the process.
(ii) Name one practical situation in which this change can be experienced.
2.
(6 marks)
In the process of producing LASERs, atoms of the active medium are excited from the ground state, n – 1
(of energy E|= -11.2 eV) to n = 3 (of energy E3 = -1.38 eV). These atoms then fall back momentarily to n = 2 (of
energy E2 = -5.82 eV). They are then stimulated by a suitable energy photon to fall back to the n = 1 level.
Define the following words and expressions used in relation to LASERs
Optical pumping;
Population inversion as used in the production of LASERs.
Explain why the LASER beam has a high intensity and calculate the wavelength of the light
produced.
3.

4. When a 0.8 kg mass is hanging from a helical spring, it produces an extension of 5.2 cm in it. The object is then
suspended from two such identical springs as shown in figure 1 below. If the mass is then pulled down through a

I
Figure 1.
further distance of 4.8 cm and allowed to oscillate freely in a vertical plane:
(a) determine the period of oscillation of the mass;
(b) sketch a graph to show how the mechanical energy of the mass varies with its displacement from
the rest position. (5 marks)

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cameroon gce A level June 2023 physics 2