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Three spheres of iron, copper and lead of equal mass are heated to 100 °C and placed on a wax slab. The iron sphere sinks deepest. What does this show about iron compared with the others?
AIron has the lowest specific heat capacity
BIron has the lowest melting point
CIron has the highest density
DIron has the highest specific heat capacity
Answer & Solution
Correct answer: D. Iron has the highest specific heat capacity
1. The sphere that absorbed the most heat releases the most heat to the wax and sinks deepest.
2. For equal mass and equal temperature rise, $Q = mc\Delta T$ is largest when c is largest.
3. Iron sinks deepest, so iron absorbed and stored the most heat, meaning it has the highest specific heat capacity among the three.
4. Melting point and density do not determine how deep the sphere sinks here, so those options are ruled out.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 5 "Heat", p.77_
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