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QPage 97: Q9: HC Verma: Concepts of Physics - Volume 2 Heat Transfer Page 97: Q9 Solution: A hot liquid is kept in a big room. The logarithm of the…

⚠️ Common Exam Traps & Conceptual Pitfalls

Newton’s law gives a linear relation for $ln(Delta T)$, where $Delta T=T_{ ext{liquid}}-T_{ ext{room}}$. Students often mistakenly log the absolute temperature $T$ instead of the difference, which destroys the straight‑line behavior.

A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly

Multiple Choice Options

  • A a straight line
  • B a circular arc
  • C a parabola
  • D an ellipse

Step-by-Step Verified Solution

**Answer:** (a) a straight line. **Step-by-Step Explanation:** Newton's law of cooling gives ln(_T) vs t as a straight line with negative slope.

All Questions in this Chapter

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