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Standard X

Physics

Latent Heat

A metal of ma...

Question

A metal of mass $200 g$ is kept at its melting point $800^{\circ} C$ . It freezes at the same temperature releasing about $30 kJ$ of energy. Find the specific latent heat of the metal in ${J g}^{- 1}$ .
150

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Solution

The correct option is A 150
Given mass of the metal, $m = 200 g$
Latent heat, $Q = 30 kJ = 30000 J$
Specific latent heat of the metal is given by,
$L = \frac{Q}{m}$

$= \frac{30000}{200}$

$= 150 {J g}^{- 1}$

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A metal of mass 200 g is kept at its melting point 800∘C. It freezes at the same temperature releasing about 30 kJ of energy. Find the specific latent heat of the metal in J g−1.150

The correct option is A 150Given mass of the metal, m=200 g Latent heat, Q=30 kJ=30000 J Specific latent heat of the metal is given by, L=Qm =30000200 =150 J g−1

A metal of mass $200 g$ is kept at its melting point $800^{\circ} C$ . It freezes at the same temperature releasing about $30 kJ$ of energy. Find the specific latent heat of the metal in ${J g}^{- 1}$ .
150

The correct option is A 150
Given mass of the metal, $m = 200 g$
Latent heat, $Q = 30 kJ = 30000 J$
Specific latent heat of the metal is given by,
$L = \frac{Q}{m}$

$= \frac{30000}{200}$

$= 150 {J g}^{- 1}$