Physics 5054 · O Level · Transfer of thermal energy

Transfer of thermal energy — practice question

Fig. 2.1 shows a hollow metal cube that is filled with boiling water. The temperature of the four vertical surfaces is the same, but each surface has a different colour or texture. Fig. 2.1 shows a metal cube with one shiny white face, a thermal radiation sensor and a meter. A thermal radiation sensor is kept at the same distance from each face, and the meter reading is used to measure the thermal radiation emitted by each one.
(a)[2]

The results appear in Fig. 2.2. Draw a line connecting each surface type to the correct meter reading. One line has already been drawn for you. Fig. 2.2 shows type of surface: dull black, dull white, shiny black, shiny white; and meter reading: 40, 60, 80, 100.

(b)[3]

The hot surfaces set up a convection current in the air outside the metal cube. Describe how this convection current comes about.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The dull black surface has a meter reading of 100.” …

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