Problem: PH 54 A parking lot is contaminated with 5-um particles of Cs-137 to a value of 500 Bq/cm². Emergency responders set up a command post in the parking lot, and work for 8 hours. Determine: a. the inhalation effective dose due to resuspension, with a resuspension factor of 2 x 10° /cm. b. the external effective dose due to direct irradiation.

12. Cylindrical metallic parabolic solar thermal concentrator A. Does not rotate. B. It rotates around one axis only. C. It rotates around two axes only. D. The concentration ratio achieved is: 500-1000. E. The concentration ratio achieved is: 50-100. F. The concentration ratio achieved is: 10-50. * A + D only. B +E only. B + F only. O C + E only

D. Much of the humidity in the air comes from vaporization from large bodies of water, like the Schuylkill and Delaware Rivers. Assuming the area of Philadelphia is 3.6 x 108 m² and the height of the city is 297 m (top of Comcast center), calculate the energy needed to reach 100% humidity by vaporizing water from the rivers at the afternoon high temperature. (For the sake of this exercise, assume ideal gas applies) a. Having trouble? Review questions from Chapter 10: 51.

An apartment has the dimensions 12 m by 6 m by 4 m. The temperature is 30°C, and the relative humidity is 56 percent. What is the total mass (in kg) of water vapor in the air in the apartment? _______ kg