Aspaceship is traveling at a speed of 15000 km/s from planet b toward planet a the spaceship sends out a signal with a wavelength og 4 nm if astronomers living on planets a and b measure the radio waves coming from the spaceship what wavelengths will they measure?

of

Astronomers living on planets a measure λO = 3.80_nm

Astronomers living on planets b measure λO = 4.2_nm

Explanation:

Astronomers living on planets a measure λO = 3.80_nm

Astronomers living on planets b measure λO = 4.2_nm

a.) Speed of the radio wave

c = 299792458 m/s.

λO = λS(c − vS)/(c − vO)

λO = observed wavelength

λS = source constant wavelength = 4 nm

c = wavefront constant velocity = 299792458 m/s

vS = velocity of the source = 15000 km/s

vO = velocity of the observer 0

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 =