CSEC Physics · January 2014 · Paper 2 · Question 4(b)(iii)

Electromagnetic waves of one wavelength are absorbed by a solar panel and waves of a longer wavelength are emitted. If electromagnetic waves of wavelength λ₁ = 2 × 10⁻⁷ m are absorbed by a solar panel as shown in Figure 3 and waves of wavelength λ₂ = 6.5 × 10⁻⁵ m are emitted, calculate

With a change of conditions, the wavelength of the wave now absorbed by the panel increased to 6 × 10⁻⁷ m, but the emitted wavelength remains at λ₂ = 6.5 × 10⁻⁵ m. What fraction of E₁, the original energy transferred, is now transferred to the solar panel? [Speed of light, c = 3.0 x 10⁸ m s⁻¹]

This question uses a figure or table from the paper — you'll see it when you practise.