Love.
https://www.google.com/imgres?imgurl=https://www.statlect.com/images/exponential-distribution__64.png&imgrefurl=https://www.statlect.com/probability-distributions/exponential-distribution&h=230&w=458&tbnid=dmG7juA_K1wHjM:&q=expectation+of+exponential+distribution&tbnh=107&tbnw=214&usg=AI4_-kRxWo5oA