JEE Main 2015 Physics question
An experiment takes min to raise the temperature of water in a container from C to C and another min to convert it totally into steam by a heater supplying heat at a uniform rate. Neglecting the specific heat of the container and taking specific heat of the water to be cal (gC), the heat of vaporization according to this experiment will come out to be:
Answer: (2)
Solution
Let the heater deliver calories per minute to a mass grams of water. In the first stage the water is heated through C, so , giving cal min. In the second stage all the water is boiled away, so , giving $L =
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