COMEDK · Physics · 12. Thermal Properties of Matter
Consider a compound slab consisting of two different materials having equal lengths, thickness and thermal conductivities \(K\) and \(2 K\) respectively. The equivalent thermal conductivity of the slab is
- A \(\sqrt{2} K\)
- B \(3 K\)
- C \(\dfrac{4}{3} K\)
- D \(\dfrac{2}{3} K\)
Answer & Solution
Correct Answer
(C) \(\dfrac{4}{3} K\)
Step-by-step Solution
Detailed explanation
Let the length of each slab be \(L\) and the cross-sectional area be \(A\). The thermal conductivities are \(K_1 = K\) and \(K_2 = 2K\). When the slabs are connected in series, the total thermal resistance \(R_{eq}\) is the sum of individual resistances \(R_1\) and \(R_2\).…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A \(10 \mathrm{~kg}\) collar is attached to a spring (spring constant \(600 \mathrm{~N} / \mathrm{m}\) ), it slides without friction over a horizontal rod. The collar is displaced from its equilibrium position by \(20 \mathrm{~cm}\) and released. What is the speed of the oscillation?COMEDK 2015 Medium
- Rainbow is formed due toCOMEDK 2013 Easy
- The instantaneous values of alternating current and voltages in a circuit given as
\(\begin{aligned}
& i=\frac{1}{\sqrt{2}} \sin (100 \pi t) \mathrm{amp}, \\
& e=\frac{1}{\sqrt{2}} \sin (100 \pi t+\pi / 3) \text { volt }
\end{aligned}\)
The average power (in watts) consumed in the circuit isCOMEDK 2023 Easy - The best waves for emission of electrons from a surface areCOMEDK 2015 Easy
- In the diagram shown below, \(m_1\) and \(m_2\) are the masses of two particles and \(x_1\) and \(x_2\) are their respective distances from the origin \(O\).
The centre of mass of the system isCOMEDK 2023 Easy - In Young's double slit experiment, the ratio of intensities of light from one slit to the other is \(9: 1\). If Im is the maximum intensity, what is the resultant intensity when they interfere at phase difference \(\phi\) ?COMEDK 2024 Medium
More PYQs from COMEDK
- Choose the incorrect statement.COMEDK 2023 Medium
- Two statements, Assertion and Reason are given below. Choose the correct option.
Assertion: n-propyl tert-butyl ether can be readily prepared in the laboratory by Williamson's synthesis.
Reason: The reaction occurs by \(\mathrm{S}_{\mathrm{N}} 1\) attack of Primary alkoxide on Tert-alkyl halide to give good yield of the product, n-propyl tert-butyl ether.COMEDK 2024 Medium - The number of unidentate ligands in the complex ion is calledCOMEDK 2020 Easy
- Two bodies of masses \(1 \mathrm{~kg}\) and \(2 \mathrm{~kg}\) have equal momentum, then the ratio of their kinetic energies isCOMEDK 2013 Easy
- In the series \(L-C-R\) circuit shown, the impedance is
COMEDK 2023 Easy - With reference to vitamins and its deficiency diseases, the correct statements are:
(i) Cheilosis is due to the deficiency of Riboflavin
(ii) The deficiency of Vitamin B6 causes pernicious anaemia
(iii) Osteomalacia is due to the deficiency of Vitamin E
(iv) The deficiency of ascorbic acid causes scurvy
(v) The deficiency of Vitamin A causes xerophthalmiaCOMEDK 2024 Easy