Tolong dijawab ya.. Trims..

TERMODINAMIKA

η = 0,5 → T₁ = 690 K
η' = 0,4 → T₁' = __?

T₁' = T₁ • [(1-η) / (1-η')]
T₁' = 690 • [(1-0,5) / (1-0,4)]
T₁' = 690 • (5/6)
T₁' = 575 K ← jwb