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How do bats fly safely in darkness ?
-Bats can fly in dark because bats emits ultrasonic waves and detect reflected ultrasonic waves. So they emit waves, the waves after striking with any obstacles in front of bats, gets reflected.The reflected waves are then detected by the bats
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Sonar
It is an device that uses ultrasonic waves in order to calculate the distance, direction and speed of underwater objects. Sonar full form is Sound Navigation and Ranging. Sonar is made of transmitter and a detector, which is installed in submarines, boat and ships
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Kidney stones treatment
Ultrasound is also used in in the treatment of small kidney stones where, they are fined into grains by the effect of ultrasonic waves and later the stones are flushed out through urine.
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Ultrasonography Scanner
An ultrasound scanner is used in this technique, which uses ultrasonic waves to get the images of internal organs of an human body like detecting the stones in gall bladder and kidney and also the tumors in different parts of the body.
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Echocardiography
It is an popular technique in which we get the image of heart,where ultrasonic waves are made to reflect various organs of our heart and form the image.
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Stethoscope
The stethoscope uses for checking of heart beat of a patient, is also an application of multiple reflection of sound.In which the heart beat of patient reaches to the ears of doctor through multiple reflection.
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Scientific definition of Echo.
It is multiple reflection of sound,where the time travel between the original sound and the reflected sound must be at least zero.
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Does sound also reflect like light ?
Like light, sound also follow the rules of reflection.hits the surface of solid or liquid, it exhibits same phenomenon, as light.
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Can you hear a sound in space ?
Sound needs a medium in order to travel, it may be solid, liquid or gas. It cannot be traveled in vacuum like space.
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Different speed of sound
The speed of light depends on that particular medium its propagate, Its speed of sound is lowest at gas, the speed of sound is more liquid as compare to gas and the speed of sound is highest in solid.
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Reverberation of sound
It is also a type of multiple reflection like echo,thought the no of repeatation of sound is more here i.e.a repeated reflection that causes persistance of sound is known as reverberation.
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How does sound propagate ?
In order to propagate, it needs a medium in which the propagation must be proceed.(Medium is kind of any object/matter/gas through which sound travels). We know that sound travels in form of wave i.e. mechanical wave & its speed varies in various medium.
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Types of sound waves
Depending upon the range of frequency of sound in hertz, the sounds are classified: - Sonic waves , infrasonic waves and ultrasonic waves.(Hertz is the the SI unit of sound & it is denoted by the symbol Hz)
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Sound and vibration
Sound is form of energy that makes a sensation of hearing in our ears. On the other hand vibration can be defined as the to and fro motion motion of any body and that to and fro motion is the key factor for the production of any kind of sound.
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Commercial unit of energy
we know that Joule is the unit of energy,but its demerits is that it is too small to express large quantity of energy.For bigger energy, we use bigger unit of energy known as "kilowatt hour (KWh)".
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Power
The power of a body may be defined as the rate of doing some amount of work.The unit of power is Watt (W).
i.e. Power=Work/time
or
P=W/T
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Law of Conservation of energy.
Law of conservation of energy definition: According to this law "energy can neither be created nor be destroyed in a chemical reaction.It can only be converted from one form to another form".
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