1.

There is formation of layer of snow x cm thick on water, when the temperature of air is -theta^(@)C (less than freezing point). The thickness of layer increased from x to in the time t, then the value of t is given by :

Answer»

`((X-y)(rhoLK))/(2theta)`
`((x+y)(x-y)rhoL)/(ktheta)`
`((x+y)(y-x)rhoL)/(2ktheta)`
`((x-y)rhoL)/(2ktheta)`

Solution :We know that TIME taken to increase the thickness of snow from x to y is
`t(rhoL)/(2ktheta)(y^(2)-x^(2))=(rhoL(y-x)(y+x))/(2ktheta)`
CORRECT CHOICE is (c).


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