A metal fragment is in a patient. The speed of sound in the tissue is 1450 m/s. The depth of the fragment is 0.265 m. What will be the time between the transducer emitting the sound and picking the sound echo up?

Time,

Explanation:

The speed of sound in the tissue is 1450 m/s and the depth of the fragment is 0.265 m.

It is required to find the time between the transducer emitting the sound and picking the sound echo up. The time taken by the sound is :

So, the time between the transducer emitting the sound and picking the sound echo up is

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 =