Ablack 4 cm x 8 cm sheet of metal is heated uniformly with 1000 watts by passing an electric current through it. one face of the rectangle is well insulated. the other face is exposed to vacuum and very cold surroundings. at thermal equilibrium what fraction of the emitted energy is in the wave number range of 0.5 to 2 μm-1 ?

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?

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Consider airflow over a flat plate of length l = 1.5 m under conditions for which transition occurs at le = 0.9 m based on the critical reynolds number, re, e = 5 x 10. evaluating the thermophysical properties of air at 400 k, determine the air velocity. (hint: use the tables to find the properties of air)