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..
Flag Meaning: The black is for the people; the white exemplifies peace, harmony, brightness, and hope; red stands for the blood spilled for freedom; the green represents Islam, blue represents the Nile River; and the star symbolizes the unity of the states of South Sudan.