Ascreen is placed between two lamps so that they illuminate the screen equally. the first lamp emits a luminous flux of 1375 lm and is 5 m from the screen. what is the distance of the second lamp from the screen if the luminous flux is 2167 lm? answer in units of m.

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 =

80cm/s.

24cm/s.

53.3cm/s.