JAMB Physics 2012 Objective — Question 24
Question 24 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2012 Objective paper, with the correct answer and a full explanation.
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The quantity of heat energy required to melt completely 1kg of ice at −30°C is [latent heat of fusion=3.5×10⁵Jkg⁻¹, specific heat capacity of ice=2.1×10³Jkg⁻¹K⁻¹]
- A. 4.13×10⁶J
- B. 4.13×10⁵JCorrect
- C. 3.56×10⁴J
- D. 3.56×10²J
Explanation
Heat required = mcΔT + mLf = (1×2.1×10³×30) + (1×3.5×10⁵) = 63,000+350,000 = 413,000J = 4.13×10⁵J.
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