Questions
A substance of mass m kg requires a power input of P watts to remain in the molten state at its melting point. When the power is turned off, the sample completely solidifies in time t sec. What is the latent heat of fusion of the substance ?
detailed solution
Correct option is B
Heat lost in t sec = mL or heat lost per sec =mLtThis must be the heat supplied for keeping the substance in molten state per sec.∴ mLt=P or L=PtmTalk to our academic expert!
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A piece of ice falls from a height h, so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is (Take, latent heat of ice is 3.4 X 105 ]/kg and g = 10 N/kg)
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