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2.3 Transfer of thermal energy

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Question 236

A hiker wears a cold-weather jacket filled with natural goose down. The down consists of many fluffy feathers that trap small pockets of air.

She explains to her companion how this jacket is so effective at keeping her warm. Three statements are proposed:

  1. Air is an excellent thermal insulator (a poor thermal conductor), which reduces heat loss by conduction.
  2. The air is trapped in very small pockets, preventing it from circulating and thus minimizing heat transfer by convection.
  3. The organic feather material itself is a poor thermal conductor.

Which statements are correct?

A

1, 2 and 3

B

1 and 2 only

C

1 and 3 only

D

2 and 3 only

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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