N° 2: Utrasound is a photographing technique stick uses ultrasounds. One of its applications is
blowing the powth of a fetus using sound waves of
Segexy 3 5 MHz
The speed of propagation of the sound waves in the
is of an order of 1500 m/s.
1) a) Justify whether the waves are audible by the fetus or not.
h) Specify the type of the waves,
c) Name the phenomenon on which this technique is based on?
2) a) Calculate the period of the wave used by ultrasound.
bi Determine the distance covered by this wave during one period. What does this
disance represent ?​

are their multiple choices ?

explanation:

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.

answer is slate

hope this