Calculate the deposition flux of no2 to cucumin dye on paper given that the indoor concentration of no2 is 10ppb and the deposition velocity of no2 to paper is 2.5x10-5 ms-1 and that 1 mg of dye is painted onto watercolour paper (5 cm x 10 cm). assuming that all no2 coming onto the paper surface will attack the dye molecules calculate the time taken to destroy all the dye on the paper.