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2.3 Transfer of thermal energy

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Question 9

Hot water is poured into a beaker and allowed to cool down for 10 minutes.

Plan an experiment to investigate whether the rate of cooling of the hot water depends upon the surface area of the water exposed to the air.

The rate of cooling of the water can be calculated using the equation:

rate of cooling=decrease in temperaturetime taken \text{rate of cooling} = \frac{\text{decrease in temperature}}{\text{time taken}} rate of cooling=time takendecrease in temperature​

You are provided with:

  • a supply of hot water (or an electric kettle and cold water)
  • a selection of beakers of different diameters
  • a measuring cylinder
  • a ruler

You may use any other common laboratory apparatus.

In your plan, include:

  • any other apparatus needed
  • a brief description of the method, including what you will measure and how you will make sure your measurements are accurate
  • the variables you will control
  • a results table to record your measurements (you are not required to enter any readings in the table)
  • how you will process your results to reach a conclusion.

You may include a labeled diagram.

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Markscheme

2.3 Transfer of thermal energy Questions

  1. IGCSE
  2. /Physics
  3. /2.3 Transfer of thermal energy

301 exam-style questions on CIE IGCSE Physics 2.3 Transfer of thermal energy, covering 2.3.1a Thermal conductors and thermal insulators, 2.3.1b Explaining thermal conduction, 2.3.2 Convection, 2.3.3a Thermal radiation, 2.3.3b Surface colour and texture, 2.3.3c Rate of emission and absorption of radiation, and 2.3.4 Consequences of thermal energy transfer. Each one has a worked solution and a mark scheme showing where the marks go.

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