What is the arc length if 0 = 2π / 3 and the radius is 4 cm?

A. 8π / 3
B. 16π / 3
C. π / 6
D. 3π / 4

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.