Section lines at 30° with horizontal upward to the right and 12.5 mm (.50") apart are
required. First find center of space by drawing
diagonals in very light construction lines.
Through center draw construction line 60° with
horizontal upward to the left and, beginning at
the center, set off 12.5 mm (.50") intervals. Draw
required section lines through these points to fill
space.

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Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?