Greenhouse Effect · Paper 1 — Free Physics SL Practice Questions

A planet receives incoming solar radiation of $300 \text{ W m}^{-2}$ and has an albedo of $0.20$. The planet emits outgoing terrestrial radiation of $240 \text{ W m}^{-2}$. Which statement correctly describes the planet's energy balance?

Incoming solar radiation at the top of Earth's atmosphere is $340 \text{ W m}^{-2}$. Clouds and the atmosphere reflect $77 \text{ W m}^{-2}$ back to space, and Earth's surface reflects $23 \text{ W m}^{-2}$ back to space. What is Earth's albedo?

Two identical sealed transparent boxes are exposed to the same intensity of infrared radiation for 10 minutes. Box A contains air with a $\text{CO}_2$ concentration of 0.04% by volume and Box B contains air with a $\text{CO}_2$ concentration of 0.08% by volume. Both boxes start at the same temperature. Which statement describes the most likely temperature change after 10 minutes?