an experiment to show how to use Safar's wheel to determine the sound pitch

The effect of the medium density on sound intensity

The relation between the light intensity of a surface and the distance between the surface and the light source

the splitting of white light into seven spectrum colors

Ship liberation game

The concept of measuring the speed of a chemical reaction

The process of oxidation and reduction according to the traditional concept

The effect of the area of the vibrating surface on the intensity of the sound

The Interaction of the Sodium Chloride Solution with The Silver Nitrate Solution