In a 10 m deep lake, the bottom is at a constant temperature of `4^(@)C`. The air temperature is constant at `- 4^(@)C. K_(ice) = 3 K_(omega)`. Neglecting the expansion of water on freezing, the maximum thickness of ice will be

In an 20 m deep lake, the bottom is at a constant temperature of 4^(@)C . The air temperature is constant at -10 ^(@)C . The thermal conductivity of ice in 4 times that water. Neglecting the expansion of water on freezing, the maximum thickness of ice will be

In an 20 m deep lake, the bottom is at a constant temperature of 4^(@)C . The air temperature is constant at -10 ^(@)C . The thermal conductivity of ice in 4 times that water. Neglecting the expansion of water on freezing, the maximum thickness of ice will be

In an 20 m deep lake, the bottom is at a constant temperature of 4^(@)C . The air temperature is constant at -10 ^(@)C . The thermal conductivity of ice in 4 times that water. Neglecting the expansion of water on freezing, the maximum thickness of ice will be

In a 10 metre deep lake, the bottom is at a constant temperature of 4^(0)C . The air temperature is constant at -4^(0)C . The thermal conductivity of ice is 3 times that of water. Neglecting the expansion of water on freezing, the maximum thickness of ice will be

M g of ice at 0^@C is mixed with M g of water at 10^@ c . The final temperature is

A rectangular block of copper (K= 0. 9). of thickness 5cm and area of cross section 10 cm^(2) has one of its faces maintained at a constant temperature of 100^(@) C while the opposite face is in contact with ice at 0^(@)C . If there is no loss of heat, the amount of ice that melts in 10 minutes is

Most substances contract on freezing . However, water does not belong to this category. We know that water expands on freezing. Further , coefficient of volume expansion of water in the temperature range from 0^(@)C to 4^(@)C is negative and above 4^(@)C it is positive . This behaviour of water shapes the freezing of lakes as the atmospheric temperature goes down and it is still above 4^(@)C . If the atmospheric temperature is below 0^(@)C and ice begins to form at t = 0 , thickness of ice sheet formed up to a time 't' will be directly proprotional to