gelombang longitudinal merambat dengan kecepatan 0,8 m/s.Jika gelombang bergetar sebanyak 150 setiap menit,hitung panjang gelombangnya!

n = 150 kali
t = 60 sekon
f = 150/60 = 2,5Hz

v = f * lambda
lambda = v/f
= 0,8/2,5 = 0,32 meter

0,32 m kaka
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