IB Physics HL B 2 1 Conservation of Energy Questions

Practise IB Physics HL B.2.1 by balancing atmospheric and surface radiation flows to analyse steady-state energy transfer in climate models.

Exam points

Use a radiation energy-balance diagram to calculate the additional intensity that must be lost to keep an ocean or planetary surface temperature constant.
Read an Earth surface–atmosphere radiation budget to determine the average intensity returned towards the surface.
Explain a steady temperature by equating the rate of thermal energy loss with the heater power supplied.

[Maximum number: 1]

The diagram shows a simple model of the energy balance in the Earth surface-atmosphere system. The intensities of the radiations are given.

What is the average intensity radiated by the atmosphere towards the surface?

$100 \mathrm{Wm}^{-2}$

$150 \mathrm{Wm}^{-2}$

$240 \mathrm{Wm}^{-2}$

$390 \mathrm{Wm}^{-2}$

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