2.3. Transfer of thermal energy
A subsection of Physics, 0625, through 2. Thermal physics
Listing 10 of 313 questions
shows a cross-section of a double-walled glass vacuum flask, containing a hot liquid. The surfaces of the two glass walls of the flask have shiny silvered coatings. vacuum hot liquid silvered surfaces Explain why the rate of loss of thermal energy through the walls of the flask by conduction is very low, why the rate of loss of thermal energy through the walls of the flask by radiation is very low. Suggest, with reasons, what must be added to the flask shown in in order to keep the liquid hot.
0625_s13_qp_31
THEORY
2013
Paper 3, Variant 1
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shows a device used as a thermocouple thermometer. meter Z wire of material Y wire of material X wire of material X In the table put three ticks against the correct statements about the thermocouple thermometer. Meter Z measures energy. Meter Z measures potential difference. Meter Z measures power. Materials X and Y are different materials. Materials X and Y are the same material. Materials X and Y are electrical conductors. Materials X and Y are electrical insulators. A liquid-in-glass thermometer is replaced by a similar thermometer with a larger bulb. No other change is made. State and explain the effect on the sensitivity. The capillary of a liquid-in-glass thermometer should have a constant diameter. shows the capillary of a thermometer made with a manufacturing fault. bulb capillary walls of non-uniform capillary glass (not to scale) State and explain the effect of this fault on the linearity of the thermometer.
0625_s15_qp_32
THEORY
2015
Paper 3, Variant 2
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shows a metal plate-warmer. metal warming-tray plate of food handle candle heater The plate-warmer contains two small candle heaters. Plates of food are placed on top of the warming-tray. State the name of a process by which the thermal energy from the candles passes to the warming-tray. State the name of the process by which thermal energy moves through the warming-tray. The outside of the plate-warmer is shiny. Suggest how this helps the plate-warmer to stay hot. The handles of the plate-warmer are made from metal. Identify a problem with this, and suggest how the problem could be solved. problem: action:
0625_s16_qp_31
THEORY
2016
Paper 3, Variant 1
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Questions Discovered
313