Quick questions on Heat transfer: conduction, convection and radiation (QCE Physics Unit 1)

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?

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Distinguish between conduction and convection in one sentence each. [2 marks]

What is q2?

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A glass window of area

2.0 \text{ m}^2

and thickness

4.0 \text{ mm}

has interior

20^\circ \text{C}

and exterior

5^\circ \text{C}

. Given

k = 0.80 \text{ W m}^{-1} \text{ K}^{-1}

, calculate the conduction heat flow rate. [3 marks]

What is q3?

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A Townsville roof cavity reaches

60^\circ \text{C}

on a summer day. (a) Identify which heat-transfer mechanism dominates between the roof iron and the ceiling, and justify. (b) Calculate the radiative loss per square metre if emissivity is

0.95

and the ceiling surface is

30^\circ \text{C}

, using

P = \sigma \varepsilon A T^4

(data given).

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