A vacuum cannot carry sound. Sound waves need a medium for transportation; usually it is air, but sound can travel through liquids or solids, too.
Sound is carried usually by air, but it can also be transferred through liquids and solids. A vaccum, like space, has no molecules or atoms to carry or transfer sound through, therefore no sound is heard.
Sound waves require the presence of matter to carry the vibrational energy. Sound carries faster through a denser medium because the molecules are closer together. There is effectively no sound in space, because sound has to have something to travel through.
Usually the medium air carries sound across distance. Without air (vavuum) no sound is carried.
used to trasmit sound to great distance
dums
yes
Audio Amplifier
sonar can not be used outside water it is used under water to transmit sound waves through ultrasonic pulses
Animals such as bats project sound waves at objects and use the time until the perception the reflected wave to determine the distance of the object. This is called echolocation. Humans have used the same principles to develop Sonar technology, which is used primarily underwater to detect objects under water (we have radar and plain sight to detect objects in air).
A cog.
An instrument used to magnify sound
Audio Amplifier
Guitar transmitters are used to transmit the sound that the musician is creating on the guitar to a speaker which is magnifying the sound for the audience.
sonar can not be used outside water it is used under water to transmit sound waves through ultrasonic pulses
The speed of sound is the distance travelled by the sound waves in the time between the original sound and the echo. For a direct echo, the distance travelled is double the distance to the reflecting surface.
A microphone is a transducer, that converts sound pressure waves into a varying electric signal. It can then be used to amplify, record or transmit sound to various other devices.
Radio-waves are used in wireless technologies to transmit data between devices over a short distance.
they would run down and tell other military purposes
It is used to step up the voltage in order to transmit it a long distance where it goes into a stepdown transformer and then into your home .
A remote control is used to control an electronic device form a distance without wires. It uses infrared or radio frequencies to transmit the data to the device.
Wavelenght
There is no real reason. In the UK's old analogue system AM was used for picture and FM used for sound. In France they used the opposite system, FM for picture and AM for sound. Everything is going digital now, so does not apply, the RF signal is a FSK data signal.
A VoIP softswitch (software switch), is a device used generally to transmit data between telephone calls with sound and also images. A example that is possible because of it is videoconferencing.