Question:
The ratio of thermal conductivity of two rods of different material is 5 : 4. The two rods of same area of cross-section and same thermal resistance will have the lengths in the ratio :
The ratio of thermal conductivity of two rods of different material is 5 : 4. The two rods of same area of cross-section and same thermal resistance will have the lengths in the ratio :
Updated On: Aug 1, 2022
- 4:05
- 9:01
- 1:09
- 5:04
Hide Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Using the relation $ \frac{{{K}_{1}}{{A}_{1}}}{{{d}_{1}}}=\frac{{{K}_{2}}{{A}_{2}}}{{{d}_{2}}} $ (Here: $ {{A}_{1}}={{A}_{2}} $ ) So, $ \frac{{{d}_{1}}}{{{d}_{2}}}=\frac{{{K}_{1}}}{{{K}_{2}}}\frac{{{A}_{1}}}{{{A}_{2}}}=\frac{5}{4} $
Was this answer helpful?
0
0
Top Questions on Heat Transfer
- The specific heat capacity of a substance is temperature dependent and is given by the formula C = kT, where k is a constant of suitable dimensions in SI units, and T is the absolute temperature. If the heat required to raise the temperature of 1 kg of the substance from −73 ° C to 27 ° C is nk, the value of n is ___[Given: 0 K = −273 °C.]
- JEE Advanced - 2024
- Physics
- Heat Transfer
- The ends of a metallic rod are at temperatures \( T_1 \) and \( T_2 \), and the rate of flow of heat through it is \( Q \, {J s}^{-1} \). If all the dimensions of the rod are halved, keeping the end temperatures constant, the new rate of flow of heat will be:
- KEAM - 2024
- Physics
- Heat Transfer
- Pressure gradient in the flow direction
- Ram efficiency is defined as
- For calorically perfect gas, specific heats \(C_p\) and \(C_v\) are
View More Questions
Questions Asked in VMMC Medical exam
- Which of the following is responsible for red colour of tomato?
- VMMC Medical - 2010
- Eukaryotic Cells
- The frequency of vibrating air column in closed organ pipe is n. If its length be doubled and radius halved, its frequency will be nearly
- VMMC Medical - 2007
- Oscillations
- A transistor is operated in common emitter configuration at constant collector voltage $ {{V}_{C}}=1.5\,V $ such that a change in the base current from 100 $ \mu A $ to 150 $ \mu A $ produces a change in the collector current from 5 mA to 10 mA. The current gain ( $ \beta $ ) is
- VMMC Medical - 2007
- Alternating current
- The temperature of sink of a Carnot engine is 27?C. If the efficiency of engine be 25%, then the temperature of source must be
- VMMC Medical - 2007
- Thermodynamics
- In producing chlorine through electrolysis 100 W power at 125 V is being consumed. How much chlorine per min is liberated? Electro chemical equivalent of chlorine is $ 0.367\,\times {{10}^{-6}}\,kg/C $ .
- VMMC Medical - 2007
- Thermodynamics
View More Questions
Concepts Used:
Heat Transfer
What is Heat Transfer?
It is defined as the movement of heat across the border of the system due to a difference in temperature between system and its surroundings.
How is Heat Transferred?
Heat can travel from one place to another in several ways. The different modes of heat transfer include:
- Conduction - Heat flows from things with higher temp to objects with lower temp.
- Convection - Movement of liquid molecules from higher temp regions to lower temp regions.
- Radiation - Radiant heat is present in every other way in our daily lives. Thermal radiations are also known to as radiant heat. Thermal radiation is generated by the emission of electromagnetic waves.
