Asolid metal weighing 150 g melts at its melting point of 800°C by providing heat at the rate of 100 W.
Asolid metal weighing 150 g melts at its melting point of 800°C by providing heat at the rate of 100 W. The time taken for it to completely melt at the same temperature is 4 min. What is the specific latent heat of fusion of the metal?
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Given:
m = 150 g = 150 × 10–3 kg= 0.15 kg
Power (P) = 100W, Time(t) = 4 min = 4 × 60 sec The amount of heat supplied in 4 min
Heat energy = 100 × 4 × 60 = 24000 J
This heat energy is used in melting.
Let 'L' be latent specific heat.
M.L =24000
L=24000 / 0.15 = 16*103 J kg -1
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