A4.0 × 102-nm thick film of kerosene (n = 1.2) is floating on water. white light is normally incident on the film. what is the visible wavelength in air that has a maximum intensity after the light is reflected? note: the visible wavelength range is 380 nm to 750 nm.

the visible wavelength is 480 nm

Explanation:

Given data

thick film = 4.0 × 10² nm

n = 1.2

wavelength range = 380 nm to 750 nm

to find out

the visible wavelength in air

solution

we know that index of water is 1 and kerosene is 1.2

we can say that when light travel reflected path difference is = 2 n t

and for maximum intensity it will be k × wavelength

so it will be  2 n t = k × wavelength

2 × 1.2 × 4.0 × 10² = k × wavelength

wavelength = 2 × 1.2 × 4.0 × 10² / k

here k is 2 for visible

so wavelength = 2 × 1.2 × 4.0 × 10² / 2

wavelength  = 480 nm

the visible wavelength is 480 nm

well, you would divide 135 by 33 to get your answer. then that is how many seconds it would take. boardman should fly about 132 m or 4.090909090909091 seconds.

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 =