When discussing engines the ratio of up at work to input work expressed as a percentage is

Efficiency η is the ratio of input work over the output work. It is defined as:

η=work done/heat absorbed=(Q₂-Q₁)/Q₁ where Q₁ is the heat absorbed and Q₂-Q₁ is the work done.

This ratio is never greater or equal to 1, or 100% because the second law of thermodynamics doesn't allow it.

I Hope my answer has come to your Help. Thank you for posting your question here in We hope to answer more of your questions and inquiries soon. Have a nice day ahead! :)

(Ps. Mark As Brainliest IF Helped!)

-TheOneAboveAll :D

Read more on -

the answer is a)

mark brainliest

number of electrons for neutral cl