Graph of spectral radiancy (E(lambda)) ...

Graph of spectral radiancy `(E_(lambda))` VS Wavelength `(lambda)` is shown in figure . Which of the following combination is correct .

1 – Sun 2-Tungsten wire, 3 - welding arc

2 – welding arc, 3 - Tungsten wire

3 – Sun , 2 - welding arc, 1 - Tungsten wire

1 - Welding arc, 2 - Sun, 3 -Tungsten wire

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