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BUNYI• intensitas
r = 5 m. I = 5×10⁻⁶ W/m²
r' = 10 m. I' = __?
intensitas
I = P / (4π r²)
intensitas berbanding terbalik dengan kuadrat jarak
Jika jarak dijadikan (10/5) = 2 kali semula, intensitas akan menjadi (½)² = ¼ kali semula atau
= ¼ × (5×10⁻⁶ W/m²)
= 1,25×10⁻⁶ W/m² ← jwb