DP Physics (first assessment 2025)

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Question 22N.2.SL.TZ0.2a.ii

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Date November 2022 Marks available [Maximum mark: 3] Reference code 22N.2.SL.TZ0.2a.ii
Level SL Paper 2 Time zone TZ0
Command term Estimate Question number a.ii Adapted from N/A
a.ii.
[Maximum mark: 3]
22N.2.SL.TZ0.2a.ii
(a.ii)

Estimate, in °C, the temperature of the roof tiles.

[3]

Markscheme

absorbed intensity = (1 − 0.2) × 680 «= 544» «W m−2»

OR 

emitted intensity = 0.97 × 5.67 × 10−8 × T4 ✓

 

T =5440.97×5.67×10-84=315 «K» ✓

42 «°C» ✓

 

Allow ECF from MP1 and MP2.

Allow MP1 if absorbed or emitted intensity is multiplied by area.

Examiners report

This was a bit more hit and miss than the previous question part. One common mistake was not understanding what albedo meant. Some took it as the amount of energy absorbed rather than reflected. Emissivity was often missed. Several candidates, successfully answering the question or not, were able to score MP3 converting the final temperature into Celsius degrees.

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