Question

For a heat engine operating between temperatures t₁ °C and t₂ °C, its efficiency will be ______.

Options

• `("t"_1 - "t"_2)/"t"_2`

• `("t"_1 - "t"_2)/("t"_1 + 273)`

• `"t"_1/"t"_2`

• `1 - "t"_2/"t"_1`

Answer 1

For a heat engine operating between temperatures t₁ °C and t₂ °C, its efficiency will be `underline(("t"_1 -"t"_2)/("t"_1 + 273)`.

Explanation:

Efficiency `eta = "W"/"Q"_1 = "Q"_1 - "Q"_2/"Q"_1 = "T"_1 -"T"_2/"T"_1`

= `("t"_1 - "t"_2)/"T"_1 + 273`