NCERT Solutions for class 11 Physics Chapter 13: Kinetic Theory

NCERT Solutions for Class 11 Physics Chapter 13: Kinetic Theory deals with the behaviour of gas molecules and ideal gas. An ideal gas is a gas that follows Boyle's law, Charles' law, Gay Lussac's law, and Avogadro’s law.

Class 11 Physics Chapter 13 Kinetic Theory belongs to Unit 9 Behaviour of Perfect Gases and Kinetic Theory of Gases. Along with Unit 7 and Unit 8, Unit 9 has a weightage of 20 marks. The NCERT Solutions for Chapter 13 deals with the molecular nature of matter and specific heat capacity.

Download PDF: NCERT Solutions for Class 11 Physics Chapter 13


NCERT Solutions for Class 11 Physics Chapter 13

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Class 11 Physics Chapter 13 – Concepts Covered

  • Boyle’s Law: According to this law, the volume (V) of a fixed mass of a gas is inversely proportional to the pressure (P) of that gas, given that the temperature of the gas is kept constant.
V ∝ 1/P or PV = constant
  • Charle’s Law: The volume (V) of a given mass of a gas is directly proportional to the temperature of the gas, given that the pressure of the gas remains constant.
V ∝ T or VT = constant
V1T= V2T2
  • Gay Lussac’s Law: The pressure P of a given mass of gas is directly proportional to its absolute temperature T, given that the volume V of the gas remains constant.
P ∝ T or PT = constant
P1T= P2T2
  • Equation of State of An Ideal Gas: The relation between pressure, volume, and absolute temperature of a gas is known as its equation of state. 

PV = nRT

n is the number of moles of the gas and R is the molar gas constant which is equal to 8.315 JK-1mol-1

  • Dalton’s Law of Partial Pressures states that the net pressure applied by a mixture of non-interacting gases is equivalent to the sum of their pressures.

P = P1 + P2 + ------- + Pn

CBSE CLASS XII Related Questions

  • 1.
    The energy of an electron in an orbit in hydrogen atom is \( -3.4 \, \text{eV} \). Its angular momentum in the orbit will be:

      • \( \dfrac{3h}{2\pi} \)
      • \( \dfrac{2h}{\pi} \)
      • \( \dfrac{h}{\pi} \)
      • \( \dfrac{h}{2\pi} \)

    • 2.
      Assertion : Photoelectric effect is a spontaneous phenomenon. Reason (R): According to the wave picture of radiation, an electron would take hours/days to absorb sufficient energy to overcome the work function and come out from a metal surface.

        • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
        • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
        • Assertion (A) is true, but Reason (R) is false.
        • Both Assertion (A) and Reason (R) are false.

      • 3.
        Consider a cylindrical conductor of length \( l \) and area of cross-section \( A \). Current \( I \) is maintained in the conductor and electrons drift with velocity \( \vec{v}_d \, (|\vec{v}_d| = \frac{eE}{m} \tau) \), where symbols have their usual meanings. Show that the conductivity of the material of the conductor is given by \[ \sigma = \frac{n e^2 \tau}{m}. \]


          • 4.

            The electric potential (V ) and electric field (⃗ E) are closely related concepts in electrostatics. The electric field is a vector quantity that represents the

              • Production of AC is economical.
              • AC can be easily and efficiently converted from one voltage to another.
              • AC can be transmitted economically over long distances.
              • AC is less dangerous.

            • 5.
              In a Young's double-slit experiment, two waves each of intensity I superpose each other and produce an interference pattern. Prove that the resultant intensities at maxima and minima are 4I and zero respectively.


                • 6.
                  A part of a wire carrying \( 2.0 \, \text{A} \) current and bent at \( 90^\circ \) at two points is placed in a region of uniform magnetic field \( \vec{B} = -0.50 \, \hat{k} \, \text{T} \), as shown in the figure. Calculate the magnitude of the net force acting on the wire.

                    CBSE CLASS XII Previous Year Papers

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