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

State and apply Newton’s first law to identify inertial motion and the conditions for zero resultant force.
Use Newton’s second and third laws to relate resultant force, mass and acceleration and to identify equal-and-opposite interaction pairs from complete mark-scheme evidence.

[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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