In this work, SnO 2 nanoparticles were successfully prepared by using Co-precipitation route, from hydrous SnCl 2 .2H 2 O (98% Merck) using aqueous ammonia, this method found to be very facile and cost-effective. Methods: The samples characterized by various techniques such as, TEM, XRD and UV-Vis spectroscopy. In this paper, an alternative way presented for experimental estimation of reduced effective mass of exciton for semiconductor nanoparticles. Results: A semiconductor nanoparticle

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... d from UV-visible spectrum and uses the effective mass approximation model, which related the energy band gap to the reduced effective mass of exciton (µ) and size of nanoparticles (R). In this paper, SnO 2 nanoparticles that are semiconductors are chosen for size estimations. The UV-visible spectrum shown that wavelength of edge has been occurred in 344.5 nm. The reduced effective mass of exciton acquired 2.495 X 10-31 Kg, using the effective mass approximation model. Conclusion: The results of this study are in well concurrence with results that are obtained from literatures.