A source emits 20.0g/s of pollutant contained in 6000 cubic meter per minute of stack gasses ( at P=a atm and T= 390K ). The maximum expected sustained wind speed at stack height is 15m/s. the heat emission rate is 7MW. For a wind speed of 8m/s ( at all heights ) and Class D stability, design a stack ( specify the height and diameter ) that will prevent ground level concentrations from exceeding 50g per cubic meter anywhere down- wind. Use the Holland formula for flume rise