Question

Tolong dibantu dengancara yang jelas dan lengkap jangan asal 8, 9, 14 15

Answer 1

9. panjang gelombang = 50 cm = 0,5 m

f= v/ panjang gelombang
= 10/0,5
= 20 hz

Answer 2

8. 5 cm = 0,05 m
2 cm = 0,02 m

(Ph)₁ = (Ph)₂
ρ₁.h₁ = ρ₂.h₂
1000.0,05 = ρ₂.0,02
ρ₂ = 50/0,02
ρ₂ = 2500 kg/m³ (B)

9. 50 cm = 0,5 m

f = v/λ
f = 10/0,5
f = 20 Hz (C)

14. W = P.t

W Kulkas = 220.24.30/1000
W kulkas = 158,4 kWh

W TV = 100.5.30/1000
W TV = 15 kWh

W Setrika = 110.2.30/1000
W Setrika = 6,6 kWh

W total = 158,4+15+6,6
W total = 180 kWh

Biaya = Rp1.550,00 x 180
Biaya = Rp279.000,00

Maaf cuma sampai no 14, no 15 saya belum tahu