What is the wavelength of an FM radio signal if the number on the dial reads 88.6
MHz? The speed of light is 3 x 108 m/s.
Answer in units of m.

V = 3.0 x 10⁸ m/s         (This is the same for all types of electromagnetic waves)

f = 88.6 MHz = 8.86 x 10⁷ Hz

λ = ?

V = fλ

λ = V/f = (3 x 10⁸)/(8.86 x 10⁷)

  =  3.4 m     [Ans]

Hope this helps!

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 =