To make an efficient laser while pumping a three-state system, which of the following conditions is necessary? (note: the lowest atomic energy state is referred to as #1, the first excited state [middle energy level] is referred to as #2, and the 2nd excited state [the highest energy state] is referred to as #3)a) The lifetime of the excited energy state at level 2 should be fairly longb) The lifetime of the excited energy state at level 2 should be fairly shortc) The lifetime of the excited energy state at level 2 doesn't matterd) None of the above

the assestment will probley apele with cause and effect

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =