JAMB Physics 2025 Objective — Question 5
Question 5 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2025 Objective paper, with the correct answer and a full explanation.
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A 0.2 kg block of ice at −10°C is heated until it melts. How much energy is required? (c_ice=2.1×10³ J/kg°C, L=3.3×10⁵ J/kg)
- A. 66700 J
- B. 4200 J
- C. 70,200 JCorrect
- D. 11500 J
Explanation
Q₁=mcΔθ=4200 J; Q₂=mL=66000 J; Total=70,200 J.
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