alleryWhat is the internal energy of 2 mol of helium at 300 K? (R = 8.31 J/mol K)
- 7.5 kJ
- 3.7 kJ
- 12.5 kJ
- 5.0 kJ
Show answer and solution
Correct answer: A. 7.5 kJ
U = n (3/2) R T = 2 × 1.5 × 8.31 × 300, about 7.5 kJ.
NEET UG Kinetic Theory & Oscillations — practice questions — page 5
Explore 141 free Kinetic Theory & Oscillations questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.
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What is the internal energy of 2 mol of helium at 300 K? (R = 8.31 J/mol K)Read the answer and worked solution →Why are Cp and Cv nearly equal for a solid?Read the answer and worked solution →What is meant by the mean free path of a gas molecule?Read the answer and worked solution →How does the mean free path depend on the molecular diameter d?Read the answer and worked solution →Gas pressure is doubled at constant temperature. What happens to the mean free path?Read the answer and worked solution →Why does gas from a leak spread slowly through a room?Read the answer and worked solution →What is the approximate mean free path of air molecules at STP?Read the answer and worked solution →Why do air molecules in a room not all settle on the floor under gravity?Read the answer and worked solution →Where does a gas in equilibrium in a container exert pressure?Read the answer and worked solution →Treating water molecules as closely packed in liquid water, the estimated molecular radius is aboutRead the answer and worked solution →Average distance between molecules of water vapour at 100 °C and 1 atm is aboutRead the answer and worked solution →Water vapour at 100 °C and 1 atm has density 0.6 kg/m³. Fraction of volume filled by molecules?Read the answer and worked solution →Who proposed that equal gas volumes at equal T and P have equal molecule numbers?Read the answer and worked solution →A gas's molecules carry translational KE of 1.5 × 10^5 J per cubic metre. Its pressure isRead the answer and worked solution →Ignoring vibrations, what is γ = Cp/Cv for a nonlinear polyatomic ideal gas?Read the answer and worked solution →Who published Hydrodynamica in 1738, laying the basis for the kinetic theory of gases?Read the answer and worked solution →Which physicist introduced the concept of the mean free path in 1857?Read the answer and worked solution →Einstein (1905) and Smoluchowski (1906) supported kinetic theory with papers onRead the answer and worked solution →Which Roman philosopher, around 50 BC, said static bodies are made of rapidly moving atoms?Read the answer and worked solution →Which physicist generalised Maxwell's velocity distribution in 1871?Read the answer and worked solution →Kinetic theory assumes the total volume of the molecules themselves isRead the answer and worked solution →
Worked practice questions
Why are Cp and Cv nearly equal for a solid?
- Its atoms have no kinetic energy
- Its pressure stays at zero
- Its atoms vibrate along one line
- Its volume change is negligible
Show answer and solution
Correct answer: D. Its volume change is negligible
Heating a solid barely changes its volume, so almost no work P ΔV is done and ΔQ ≈ ΔU.
What is meant by the mean free path of a gas molecule?
- Average distance between two collisions
- Diameter of a single gas molecule
- Average gap between molecules at rest
- Distance a molecule covers each second
Show answer and solution
Correct answer: A. Average distance between two collisions
It is the average distance a molecule travels between two successive collisions.
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