SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The amount of energy needed to melt 1 kg of a substance.
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The amount of energy needed to boil 1 kg of a substance.
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The amount of energy needed to condense 1 kg of a substance.
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None of the above
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Detailed explanation-1: -The amount of energy required to change the state of 1 kg of a material is known as specific latent heat. Hence the amount of heat needed to turn 1 Kg of solid into liquid at atmospheric pressure at its melting point is known as specific latent heat of fusion.
Detailed explanation-2: -The specific latent heat of a substance is the amount of energy needed to change the state of 1 kg of the substance without changing its temperature.
Detailed explanation-3: -Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid state without any change in temperature, at its melting point.
Detailed explanation-4: -The latent heat of fusion of water at 0∘C is 334 joules/ kg. 334 joules is the extra energy required after reaching 0∘C.