Enrichment of soil through decomposition of leaves etc.

Linked PYQ

Radiation of wavelength 2500 Å was passed through a cell containing 10 ml of solution which was 0.05 molar in oxalic acid and 0.01 molar in uranyl sulphate. After absorption of 80 joules of radiation energy, the concentration of oxalic acid was reduced to 0.04 molar. Calculate the quantum yield for the photochemical decomposition of oxalic acid at the given wavelength.