WAEC - Physics (1990 - No. 19)
How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg-1k-1 cools from 85oC to 25oC?
1.38 x 106 J
2.53x104J
7.66x103J
1.38x103J
1.27 X103J
स्पष्टीकरण
Q = mcΔθ = 0.050 x 460 x (85 - 25) = 1.38x103J