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Modern periodic Table 0

The attempts of the elements classification

The elements The scientists classified the elements according to their properties to facilitate their study and to find a relationship between the elements, and their chemical and physical properties.

Sound wave 0

How can the human ear differentiate between sounds?

The sound waves The human ear differentiates between the sounds that reach it through the different factors which are the sound pitch, the sound intensity and the sound quality. The sound pitch The sound...


The types of sound waves

Sound waves There are two types of the sound waves which are the audible sounds and the non-audible sounds, The audible sounds such as the sonic waves, and the non-audible sounds such as the...