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State whether it is true that “the A spectrum is AM0 and the B spectrum is AM1.5”. Explain why B is weaker than A across the whole wavelength range. Show how you estimate the surface temperature of the Sun using the given spectrum.

- A
2.2
2
1.8
Black body spectrum (T = 5778 K)
1.6
1.4
B
1.2
1
Water vapour absorption
0.8
0.6
CO,, H,O
0.4
0.2
200 400
600 800 1000 1200 1400 1600 1800 2000 2200 2400
+ uv + Visible + IR +
Wavelength in nm
Source: K. Mertens: textbook-pv.org
Spectral irradiance in W/(m² . nm)

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