Astudy by the environmental protection agency looked at the costs and benefits of the clean air act from 1970 to 1990. this study found that a middle-range estimate of the health and other benefits from cleaner air was $22 trillion. this amount was about than the costs of reducing the pollution. a. 10 times lower b. 44 times higher c. 10 times higher d. 44 times lower

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?