Edexcel A-Level Physics Specific Latent Heat Practical

Practise Edexcel A-Level Physics specific latent heat practical ideas by judging vaporisation results against accepted values and error sources.

Exam points

judge latent-heat vaporisation results by linking heater power errors to textbook-value differences

[Maximum number: 1]

In an experiment to determine the specific latent heat of vaporisation of water $L_{\mathrm{V}}$ , a student used an electrical heater to boil water in a beaker.

The experimental data gave $L_{\mathrm{V}}=2.20 \mathrm{MJ} \mathrm{kg}^{-1}$ . The textbook value of $L_{\mathrm{V}}$ is $2.26 \mathrm{MJ} \mathrm{kg}^{-1}$ .
Which of the following could be an explanation for this difference in the values of $L_{\mathrm{V}}$ ?

Some energy is transferred to the surroundings.

The heater power was underestimated.

The student did not stir the water.

The heater is inefficient.

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5.3.127 - Core Practical 13 - specific latent heat question 1