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Option D: Energy and the Environment
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Energy balance and source choices

Energy balance and source choices

Earth energy balance showing incoming solar radiation, reflection, outgoing infrared radiation, and greenhouse gases re-emitting some infrared Earth's average temperature is stable only when the power it absorbs from the Sun equals the power it radiates back into space. Greenhouse gases such as CO2CO_2CO2​ absorb and re-emit some outgoing infrared, so Earth warms until a new balance is reached.

Option D: Energy and the Environment Lesson

  1. A Level
  2. /Physics
  3. /Option D: Energy and the Environment

Step-by-step lessons on Eduqas A Level Physics Option D: Energy and the Environment. Each one builds up to exam-style questions. Physics is one of the most mathematically demanding A Levels -- a minimum of 40% of the marks require maths skills at Level 2 (GCSE) standard or above, so build calculation and graph-handling fluency alongside the conceptual content from the start.

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