A gaseous pollutant ROH in the air can photolyze in sunlight, shown as

$)<mi\; id="EditorElement\_618085">(</mi><mn\; id="EditorElement\_618069">3</mn><mn\; id="EditorElement\_618070">0</mn><mn\; id="EditorElement\_618071">0</mn><mi\; id="EditorElement\_618073">n</mi><mi\; id="EditorElement\_618075">m</mi>$

The absorption cross section and the intensity of sunlight are shown in the below table. The quantum yield for the light that can initiate the photolysis is $1\mathrm{.}0$ molecules$/$photor Please estimate how long it takes for $10m\frac{g}{L}$ROH reduced to be $0\mathrm{.}5m\frac{g}{L}?$

$\backslash$table$[[$Wavelength $(nm),\backslash$table$[[$Absorption cross section$],[$ molecule