A Carnot engine working between $300 K$ and $400 K$ has $800 J$ of useful work. The amount of heat energy supplied to the engine from the source is

2400 J

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3200 J

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1200 J

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3600 J

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Solution

The correct option is C $3200 J$
Given : $T_{H} = 400$ K $T_{L} = 300$ K
Useful work, $W = 800$ J
Using efficiency, $η = 1 - \frac{T_{L}}{T_{H}} = \frac{W}{Q_{H}}$
Or, $1 - \frac{300}{400} = \frac{800}{Q_{H}}$ $⟹ Q_{H} = 3200$ $J$

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A Carnot engine working between 300K and 400K has 800J of useful work. The amount of heat energy supplied to the engine from the source is

The correct option is C 3200JGiven : TH=400 K TL=300 KUseful work, W=800 JUsing efficiency, η=1−TLTH=WQHOr, 1−300400=800QH ⟹QH=3200 J

A Carnot engine working between $300 K$ and $400 K$ has $800 J$ of useful work. The amount of heat energy supplied to the engine from the source is

The correct option is C $3200 J$
Given : $T_{H} = 400$ K $T_{L} = 300$ K
Useful work, $W = 800$ J
Using efficiency, $η = 1 - \frac{T_{L}}{T_{H}} = \frac{W}{Q_{H}}$
Or, $1 - \frac{300}{400} = \frac{800}{Q_{H}}$ $⟹ Q_{H} = 3200$ $J$