# Chapter 13 – Kinetic Theory Questions and Answers: NCERT Solutions for Class 11 Physics

Class 11 Physics NCERT book solutions for Chapter 13 - Kinetic Theory Questions and Answers.

Education Blogs Chapter 13 – Kinetic Theory Questions and Answers: NCERT Solutions for Class...

Class 11 Physics NCERT book solutions for Chapter 13 - Kinetic Theory Questions and Answers.

(a) What does the dotted plot signify?

(b) Which is true : T1> T2or T1< T2?

(c) What is the value of PV/T where the curves meet on the y-axis?

(d) If we obtained similar plots for 1.00 x 10-3kg of hydrogen, would we get the same value of PV/T at the point where the curves meet on the y-axis? If not, what mass of hydrogen yields the same value of PV/T (for the low-pressure high-temperature region of the plot) ?(Molecular mass of H2= 2.02 u, of O2= 32.0 u, R = 8.31 J mol-1K-1.)

(b) The upper position of PV/T shows that its value is lesser for T1thus T1> T2. This is because the curve at T1is more close to dotted plot than the curve at T2Since the behaviour of a real gas approaches the perfect gas behaviour, as the temperature is increased.

(c) Where the two curves meet, the value of PV/T on y-axis is equal to μR. Since ideal gas equation for μ moles is PV = μRT

Here, M = 39.9; M’ = 4.0; T =?; T = -20 + 273 = 253 K

.’. P1= 76 cm and V1= 15 cm3

If R1and R2be the rates of diffusion of two gases having molecular masses M1and M2respectively, then

where n2, n1refer to number density at heights h2and h1respectively. Use this relation to derive the equation for sedimentation equilibrium of a suspension in a liquid column :

n2= n1exp [ – mg NA(ρ – P) (h2– h1)/(ρ RT)] where ρ is the density of the suspended particle, and ρ that of surrounding medium. [NAis Avogadro’s number, and R the universal gas constant.]

[Hint: Use Archimedes principle to find the apparent weight of the suspended particle.]

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