logo

Ask Questions, Get Answers

 
X
 Search
Want to ask us a question? Click here
Ad
Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Thermodynamics
0 votes

Two rods of equal cross - section have their ratio of lengths 1 : 2 . If the ratio of their coefficient of thermal conductivity are in the ratio 3 : 4 , the ratio of time taken for heat transfer for same temperature differance is -

$(a)\;3 :8\qquad(b)\;8 :3 \qquad(c)\;2 : 3\qquad(d)\;3 : 2$

Can you answer this question?
 
 

1 Answer

0 votes
Answer : $2 : 3$
Explanation :
$\large\frac{\bigtriangleup Q}{\bigtriangleup t}=\large\frac{KA}{l}\;\bigtriangleup T$
$t \propto \large\frac{l}{k} \quad \;(for\; \bigtriangleup T and\; A\; same)$
$\large\frac{t_{1}}{t_{2}}=\large\frac{l_{1}}{l_{2}} . \large\frac{k_{2}}{k_{1}}=\large\frac{1}{2} \times \large\frac{4}{3}=\large\frac{2}{3}$
answered Mar 13, 2014 by yamini.v
 

Related questions

Ask Question
student study plans
x
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App
...