No 14 Perhatikan gambar Frekuensi periode dan rambat gelombang tersebut

f = n/t = 6/1,5 = 6.15/10 = 90/10 = 9

T = 1/f = 1/9 = 0,111

panjang gelombang = jarak/n = 90/3 = 30 cm = 30/100 = 0,3 m

v = 3/10 . 9
= 27/10 = 2,7 m /s

#:-) :-) :-)