Page 136 - text book form physics kssm 2020

Results:
Table 4.3
Power of immersion heater, P / W
Heating time, t / s

Mass of water, m / kg

Initial temperature of water, θ / °C
1
Final temperature of water, θ / °C
2
Analysis of data:
Calculate the specifi c heat capacity of water using the formula, c = Pt .
m(θ – θ )
Conclusion: 2 1
What conclusion can be made from this experiment?
Prepare a complete report on this experiment.
Discussion:
1. Why does the beaker need to be wrapped with tissue paper?
2. Why is the fi nal water temperature, θ not taken as soon as the fi ve-minute heating time
2
ends?
3. Given specifi c heat capacity of water is 4 200 J kg °C , compare the value of specifi c
–1
–1
heat capacity of water obtained from the experiment with the value given. Explain the
difference between the two values (if any).
4. Suggest methods to increase the accuracy of the result of this experiment.

Experiment 4.2

Aim: To determine the specifi c heat capacity of aluminium
Apparatus: Power supply, immersion heater, 1 kg aluminium block, stopwatch, thermometer
and retort stand
Material: Tissue paper
Procedure:
1. Set up the apparatus as shown in Figure 4.11.

Retort
stand
Immersion
heater Power supply
Thermometer

Aluminium
block
Tissue paper

Figure 4.11
130
130 4.2.3
4.2.3