It is reasonable to expect that given growing wealth, the emergence of a middle class, access to modern conveniences, and so forth, the ‘emerging’ countries of the world may experience exponential growth in energy consumption over the short to medium term. from data introduced earlier, these countries consumed 136 ej of energy in 1990 and 198 ej in 2004. use these data points and the exponential curve to predict energy consumption in 2020. discuss the implications of this prediction.

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?