Question

A 60 W electric lamp gives off energy in the form of light at the rate of 7.5 J/s

Answer 1

The energy given off is 7.5 J /second.This means that the lamp is giving off 7.5W.You simply have to calculate that how much percentage is 7.5of 60.

7.5/60x100= 75/6=12.5%

Hence our answer is 12.5%Hope this helps!!!!!!!!!!!!!

Answer 2

7.5×60/100=12.5
that's it