4. Perhatikan gelombang transversal dibawah ini!

panjang gelombang = 1 1/2 pnjng glmbng ÷ n glmbng
= 150 cm ÷ 1 1/2 = 150 ÷ 3/2 = 150 × 2/3 = 300/3 = 100 cm

150 × 10 : 15 = 100 cm