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5.3 Black body radiation

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Question 32
H

In a model, Earth's average incoming solar intensity is 340 W/m2. Initially, 100 W/m2 is reflected and 240 W/m2 is emitted to space.

The reflected intensity falls to 90 W/m2. All other factors are initially unchanged. Which gives the initial energy imbalance and the outgoing emitted intensity at the new balance?

[1]
A

net gain 10 W/m210\,\mathrm{W/m^2}10W/m2; new emission 250 W/m2250\,\mathrm{W/m^2}250W/m2

B

net loss 10 W/m210\,\mathrm{W/m^2}10W/m2; new emission 250 W/m2250\,\mathrm{W/m^2}250W/m2

C

net gain 10 W/m210\,\mathrm{W/m^2}10W/m2; new emission 230 W/m2230\,\mathrm{W/m^2}230W/m2

D

net loss 10 W/m210\,\mathrm{W/m^2}10W/m2; new emission 230 W/m2230\,\mathrm{W/m^2}230W/m2

Markscheme

5.3 Black body radiation Questions

  1. GCSE
  2. /Physics
  3. /5.3 Black body radiation

96 exam-style questions on Edexcel GCSE Physics 5.3 Black body radiation, covering 5.3.1 Emission of radiation and temperature, 5.3.2 Radiation balance and constant temperature, and 5.3.3 The temperature of the Earth. Each one has a worked solution and a mark scheme showing where the marks go.

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