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 ?​

it about 600 mph from what i calculated

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

volts times amps 6 x 0.5 3w

it doesn't. it was imagined up in the middle ages.