Finding sources of information is done in waves throughout a research project.

The frequency of a sound wave determines how fast the sound travels. It is defined that frequency I the number of complete cylcles or waves per second in an alternating current (AC) direction. Its SI unit is in HZ or hertz in honor of the German physicist Heinrich Rudolf Hertz. The more frequency the sound is the faster it travels. An example of this is the violin. It vibrates 440 Hz or 440 vibrations per second. Therefore the violin will produce more sound.   

the african society basically suffered the consequences of colonization and apartheid directly attacking the black people, first, during the colonialism and its main idea which which "white people" had better rights, affecting   them principally in the right to establish black people in their territories, access to quality education and health services and took away any civil right even to the black people to feel they have the same opportunities as the settlers.

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