Properties Of Solids And Liquids Question 435
Question: Ice starts forming in a lake with water at $ 0{}^\circ C $ when the atmospheric temperature is $ -10{}^\circ C $ . If the time taken for the first 1 cm of ice to be formed is 7 hours, then the time taken for the thickness of ice to change from 1 cm to 2 cm is
Options:
A) 7 hours
B) 14 hours
C) 21 hours
D) 3.5 hours
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Since no heat flows through me central rod, temperature at the ends of the central rod will be same. So, it will form a wheatstone like network.
So.$ \frac{K _{1}}{K _{2}}=\frac{K _{3}}{K _{4}}\Rightarrow k _{1}k _{4}=k _{2}k _{3} $
