Ametallic surface emits electrons when it is irradiated with a yellow light source of power 25 watts. what happens to the emission of the electrons if one yellow light source is replaced by two violet light sources of same power?

see earlier

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 =

snell's law

refractve index = sin incidence / sin refraction