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Doppler Effect
Depends on the context... can you explain further your question?
That is the resonant frequency.
The intensity of a sound will decrease according to an inverse square law.
that's due to Doppler effect. its the relative velocity between speed of the 'source and the receiver' and the speed of the sound that causes the effect... its just an illusion.
level of source receiver
No change in frequency or wavelength.
A true echo is one in which the source of sound is located in close vicinity to the receiver. You will requirea pulse of sound,a reflecting surface which is more than 17.2 metres from the sound source,the reflecting surface must be sufficiently smooth and at right angles to the direction of travel of the sound waves.
Heat energy can be transferred from a source to a receiver by conduction, convection, and radiation.
receiver capsule is a telephone device who can detect sound wave
Sonar.
Audio In refers to the connection where you would plug in your source for the sound you are trying to hear. For example when you have a guitar and you want the sound to come through and amp then you would plug your guitar into the audio in. If you are working with a mixer or a home receiver, you audio source might be a CD player or a computer.