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प्रश्न
A 30 watt immersion heater just keeps 600 g of molten metal at its melting point. The heater is switched off and the temperature starts falling after 6 min. Calculate sp. latent heat of fusion of the metal.
संख्यात्मक
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उत्तर
The heat supplied by the heater while the metal changes state is Q = Pt.
Time = 6 × 60 = 360 s
Q = 30 × 360 = 10800 J
Using Q = mL
$$L = \frac{Q}{m}$$
$$= \frac{10800}{600}$$
= 18 Jg−1
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