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} $



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