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 ?​

How many milliliters of water at 23 °c with a density of 1.00 g/ml must be mixed with 180 ml (about 6 oz) of coffee at 95 °c so that the resulting combination will have a temperature of 60 °c? assume that coffee and water have the same density and the same specific heat. how much will the temperature of a cup (180 g) of coffee at 95 °c be reduced when a 45 g silver spoon (specific heat 0.24 j/g °c) at 25 °c is placed in the coffee and the two are allowed to reach the same temperature? assume that the coffee has the same density and specific heat as water. a 45-g aluminum spoon (specific heat 0.88 j/g °c) at 24 °c is placed in 180 ml (180 g) of coffee at 85 °c and the temperature of the two become equal. (a) what is the final temperature when the two become equal? assume that coffee has the same specific heat as water. (b) the first time a student solved this problem she got an answer of 88 °c. explain why this is clearly an incorrect answer.