A block of an unknown substance is heated by a heater

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

0.5\,\text{kg}

block of an unknown substance is heated by a

200\,\text{W}

heater. The temperature rises steadily from

-10^{\circ}\text{C}

0^{\circ}\text{C}

100\,\text{s}

and then remains at

0^{\circ}\text{C}

for

300\,\text{s}

until the entire mass melts. What is the latent heat of fusion of the substance? (a)

1.6\times10^{5}\,\text{J}\,\text{kg}^{-1}

(b)

1.2\times10^{5}\,\text{J}\,\text{kg}^{-1}

(c)

6.0\times10^{4}\,\text{J}\,\text{kg}^{-1}

(d)

2.4\times10^{5}\,\text{J}\,\text{kg}^{-1}