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?

How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg^-1k^-1 cools from 85^oC to 25^oC?

A 1.38 x 10⁶ J
B 2.53x10⁴J
C 7.66x10³J
D 1.38x10³J
E 1.27 X10³J

waec 1990 physics

The correct answer is D. 1.38x10³J

Q = mcÎÎ¸ = 0.050 x 460 x (85 - 25) = 1.38x10³J

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