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प्रश्न
A molten metal weighing 150 g is kept at its melting point 800 °C, when the metal is allowed to solidify at the same temperature, it releases 75,000 J of heat energy. What is the specific latent heat of the metal?
संख्यात्मक
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उत्तर
The metal is solidifying at its melting point, so the temperature remains constant and the heat released is only latent heat.
Heat released, Q = 75,000 J
Mass of metal, m = 150 g = 0.150 kg
Using Q = mL
\[L = \frac{Q}{m}\]
= \[\frac{75000}{0.150}\]
= 5,00,000 J/kg
Therefore, the specific latent heat of fusion of the metal is 5 × 105 J/kg (or 500 J/g).
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