In a longitudinal wave, the motion of the medium is parallel to the direction of the wave. This means that the particles move left and right which in turn makes the other particles start to oscillate.
The UNIA founded by Marcus Garvey has a constitution which defines red, black, and green as the Pan-African colours: red representing the noble blood that unites all people of African ancestry, the colour black for the people, green for the rich land of Africa..
The red band symbolizes Sudan's struggle for liberation. The white color is the sign of brightness, harmony, and hope. The black color represents the country itself. The green color is the symbol of Islam, the affluence of the nation, and cultivation. Proportion. 1:2. Colors. Black, green, and red.