1. Sound
Sound is a form of energy. Sound waves are produced by the vibration of an object placed in a medium.
definition:
2. Echo
A repeated sound that is caused by the reflection of sound waves from a surface.
definition: https://youtu.be/y0TyDa8PepM
echo reduction way: https://youtu.be/ULE8DnPy8OE
3. Noise
Unwanted backgound sounds are sometimes called noise. When the sound level of this noise reises to higher level, we refer to this as noise pollution.
definition: https://youtu.be/9k333BNk8Uc
example: https://youtu.be/p7XkZleu9aY
☞ noise reduction : https://youtu.be/wIKE0VgvGcw
4. sound interference
the superposition of waves, causing an increase or decrease in the amplitude of the resulting wave
experiment: https://youtu.be/ViQjjR8wN-I
definition for Interference, Reflection, and Diffraction: https://youtu.be/eW5VGGJuWtQ
5. Resonance
A phenomenon in which an external force or a vibrating system forces another system around it to vibrate with greater amplitude at a specified frequency of operation.
example:
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