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This paper is an empirical study aimed at finding out the effect of improvised material on students’ academic achievement and retention on the concept of radioactivity. The study adopted the pretest post test non-equivalent control group design and was carried out in Calabar Education Zone, Cross River State Nigeria. A total of two hundred and forty seven (247) Senior Secondary School III Physics students took part in the study. The Analysis of Covariance (ANCOVA), Multiple Analysis (MCA) and t-test were used to analyze the data. The results of the study showed a significant difference in academic achievement between the experimental and control groups in favour of the experimental group, a significant difference in the mean academic achievement between the male and the female students in favour of the male students and a significant difference in the retention between the experimental and control groups in favour of the experimental group. The study recommend among others the use of improvised material in the teaching of physics where the accredited ones are lacking.

Effects of Improvised Materials on Students’ Achievement and Retention of the Concept of Radioactivity