An experiment takes 10 minutes to raise the temperature of water in a container from 0°C to 100°C and another 55 minutes 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 water to be 1 cal/g °C, the heat of vapourization according to this experiment will come out to be :
← JEE Main 2015 · 11 Apr · Shift 1
PhysicsSingle correct+4 / -1Question 10 of 90
JEE Main 2015 · 11 Apr · Shift 1, Physics question 10
Answer and worked solution
Official answer: C
Heating 1 g by 100 °C takes 100 cal in 10 min, so the heater supplies 10 cal per gram per minute. In 55 min that is 550 cal/g.
Topics:Latent heat and phase change