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QPage 34: Q20: HC Verma: Concepts of Physics - Volume 2 Kinetic Theory of Gases Page 34: Q20 Solution: Which of the following quantities is zero on an average for the …
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often confuse the average of a vector quantity with the average of its magnitude; while the vector sum of momenta cancels out to zero due to random directions, the average speed and kinetic energy remain non-zero positive values.
Which of the following quantities is zero on an average for the molecules of an ideal gas in equilibrium?
Multiple Choice Options
- A Kinetic energy
- B Momentum
- C Density
- D Speed
Step-by-Step Verified Solution
**Answer:** (b) Momentum.
**Step-by-Step Explanation:**
In equilibrium, molecules move randomly in all directions. The average momentum (vector) is zero. Kinetic energy, density, and speed are not zero on average.
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