(i) Write an expression for the heat energy liberated by a hot body.

1.	(i) Write an expression for the heat energy liberated by a hot body. (ii) Some heat is provided to a body to raise its temperature by 25°C. What will be the corresponding rise in temperature of the body as shown on the kelvin scale ? (iii) What happens to the average kinetic energy of the molecules as ice melts at 0°C ?
Answer» (i) ∆Q = mc ∆t where m —> mass, c —> specific heat capacity, ∆t —> change in temperature. (ii) Since ∆Q ∝ ∆t Hence the corresponding rise in temperature of the body in Kelvin = 25K. (iii) Avg. kinetic energy of the molecules would remain same.

(i) Write an expression for the heat energy liberated by a hot body. (ii) Some heat is provided to a body to raise its temperature by 25°C. What will be the corresponding rise in temperature of the body as shown on the kelvin scale ? (iii) What happens to the average kinetic energy of the molecules as ice melts at 0°C ?

Answer»

(i) ∆Q = mc ∆t where m —> mass, c —> specific heat capacity, ∆t —> change in temperature.

(ii) Since ∆Q ∝ ∆t Hence the corresponding rise in temperature of the body in Kelvin = 25K.

(iii) Avg. kinetic energy of the molecules would remain same.