JEE Advance - Physics (2013 - Paper 2 Offline - No. 6)
List I
P. Boltzmann ConstantQ. Coefficient of viscosity
R. Plank Constant
S. Thermal conductivity
List II
1. [ML2T-1]2. [ML-1T-1]
3. [MLT-3K-1]
4. [ML2T-2K-1]
Explanation
Let's break down the dimensional analysis of each physical quantity:
P. Boltzmann Constant ($k_B$)
The Boltzmann constant relates energy to temperature. Its dimensional formula is derived from the relationship: $E = k_B T$.
Energy ($E$) has dimensions of [ML2T-2]. Temperature ($T$) has dimensions of [K]. Therefore:
$$[k_B] = \frac{[E]}{[T]} = \frac{[ML^2T^{-2}]}{[K]} = [ML^2T^{-2}K^{-1}]$$
Q. Coefficient of Viscosity ($\eta$)
Viscosity is a measure of a fluid's resistance to flow. It is defined as the ratio of shear stress to shear rate. Shear stress has dimensions of [ML-1T-2] (force per unit area), and shear rate has dimensions of [T-1] (velocity gradient). Therefore:
$$[\eta] = \frac{[ML^{-1}T^{-2}]}{[T^{-1}]} = [ML^{-1}T^{-1}]$$
R. Plank Constant ($h$)
Planck's constant relates energy to frequency. Its dimensional formula is derived from the relationship: $E = h\nu$.
Energy ($E$) has dimensions of [ML2T-2]. Frequency ($\nu$) has dimensions of [T-1]. Therefore:
$$[h] = \frac{[E]}{[\nu]} = \frac{[ML^2T^{-2}]}{[T^{-1}]} = [ML^2T^{-1}]$$
S. Thermal Conductivity ($k$)
Thermal conductivity is a measure of a material's ability to conduct heat. It is defined as the rate of heat transfer per unit area per unit temperature gradient. Heat transfer rate has dimensions of [ML2T-3]. Area has dimensions of [L2], and temperature gradient has dimensions of [K/L]. Therefore:
$$[k] = \frac{[ML^2T^{-3}]}{[L^2][K/L]} = [MLT^{-3}K^{-1}]$$
Matching the Dimensions:
Based on the dimensional analysis, we can match the quantities in List I with the dimensions in List II as follows:
List I | List II |
---|---|
P. Boltzmann Constant ($k_B$) | 4. [ML2T-2K-1] |
Q. Coefficient of Viscosity ($\eta$) | 2. [ML-1T-1] |
R. Plank Constant ($h$) | 1. [ML2T-1] |
S. Thermal conductivity ($k$) | 3. [MLT-3K-1] |
Therefore, the correct answer is Option C.
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