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Question 19M.2.HL.TZ2.7ci

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.HL.TZ2.7ci
Level HL Paper 2 Time zone TZ2
Command term Calculate Question number ci Adapted from N/A
ci.
[Maximum mark: 2]
19M.2.HL.TZ2.7ci

The average temperature of ocean surface water is 289 K. Oceans behave as black bodies.

The intensity in (b) returned to the oceans is 330 W m-2. The intensity of the solar radiation incident on the oceans is 170 W m-2.

(ci)

Calculate the additional intensity that must be lost by the oceans so that the water temperature remains constant.

[2]

Markscheme

water loses 396 − 330/66 «W m −2» ✔

extra intensity that must be lost is «170 − 66» = 104 ≈ 100 «W m−2» ✔

OR

absorbed by water 330 + 170/500 «W m−2»✔

extra intensity that must be lost is «500 − 396» = 104 ≈ 100 «W m−2» ✔

Examiners report

This was well-answered, a very straightforward 2 marks.

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