A Carnot engine works between $400 K$ and $300 K$ . What is its efficiency (in %)?

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A Carnot engine works between $800 K$ and $400 K$ . What is its efficiency (in %)?
A Carnot engine works between $600 K$ and $300 K$ . What is its efficiency (in %)?
A Carnot engine works between $500 K$ and $300 K$ . What is its efficiency (in %)?
A Carnot engine works between $500 K$ and $400 K$ . What is its efficiency (in %)?
A Carnot engine works between $1000 K$ and $500 K$ . What is its efficiency (in %)?

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