$J$ (Joule's mechanical equivalent of heat) is equal to:

418 J {c a l}^{- 1}

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4.18 J {c a l}^{- 1}

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2.2 J {c a l}^{- 1}

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41.8 J {c a l}^{- 1}

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Solution

The correct option is B $4.18 J {c a l}^{- 1}$
According to Joule's law, the mechanical equivalent of heat is the ratio of the mechanical work done by a system to the heat supplied.
$J = \frac{W}{Q}$
Mathematically, $J = 4.18$ $J c a l^{- 1}$
(If work done and heat produced is measured in joules and calories respectively)

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J (Joule's mechanical equivalent of heat) is equal to:

The correct option is B 4.18 Jcal−1According to Joule's law, the mechanical equivalent of heat is the ratio of the mechanical work done by a system to the heat supplied.J=WQMathematically, J=4.18 Jcal−1(If work done and heat produced is measured in joules and calories respectively)

$J$ (Joule's mechanical equivalent of heat) is equal to: