B.2 Greenhouse effect Quiz
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5 questions, one answer each
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1. A surface at 400 K has emissivity 0.50. What power does it radiate per square metre?
- A. 726 W m⁻²
- B. 1450 W m⁻²
- C. 11.3 W m⁻²
- D. 2900 W m⁻²
2. A planet has solar constant 2000 W m⁻² and albedo 0.40. What is the mean intensity it absorbs?
- A. 1200 W m⁻²
- B. 500 W m⁻²
- C. 300 W m⁻²
- D. 200 W m⁻²
3. Which change would increase the Earth's albedo?
- A. Melting of Arctic sea ice
- B. Increased cloud cover
- C. Replacing grassland with dark tarmac
- D. Rising CO₂ concentration
4. Why does the Earth's surface emit mainly infrared rather than visible radiation?
- A. Its temperature is much lower than the Sun's, so by Wien's law its peak wavelength is longer
- B. Greenhouse gases convert visible light into infrared
- C. The Earth has a high albedo
- D. Infrared is absorbed less by the ground
5. Which statement describes the enhanced greenhouse effect?
- A. The natural warming of the Earth by its atmosphere
- B. Extra warming caused by human increases in greenhouse-gas concentrations
- C. Cooling caused by increased albedo
- D. Warming caused by increased solar output