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Consider the difference in sound between a large empty room that only has hard walls to reflect sound compared to a room with different kind of furniture and curtains or drapes. An echo occurs when sound (sound waves) reach a solid object that reflects the sound away and back to where it originated. If there is no echo than any or all of the following occurred:The sound waves were reflected in a different direction.The sound waves were absorbed when they reached a soft material that does not reflect sound well. The sound energy is converted to smaller vibration in the material which dissipate.The sound waves were attenuated (lessened) as they traveled through the air until it was inaudible (couldn't be heard). Some of the waves are absorbed by the ground, grass, trees or bounced away by obstructions and the rest are absorbed by air particles which gain a little energy from it.Interestingly, the amount of air particles over water is less than over land and most people are aware that sound travels further over water.
Microphones will convert sound waves into electrical signals. An ear (i..e human ear) will also convert sound waves into electrical signals.
I would expect any movement of matter to cause some sound.
Particles. They can't travel through a vacumm
sound
sound waves aka pressure waves
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Ocean waves, seismic waves, and sound waves are some examples.
Ocean waves, seismic waves, and sound waves are some examples.
Ocean waves, seismic waves, and sound waves are some examples.
waves, and sound with the transverseness shut up
Sound, and P-waves of an earthquake.
Some examples include waves on a water surface; sound waves; electromagnetic waves (this includes light); and gravitational waves.
Mechanical waves are waves that need a medium to go through. Some examples are ocean waves, seismic waves, and sound waves. Also when a slinky moves back and forth or at right angles it is like a wave.
Sound waves are not liquid. Sound waves are merely vibrations transmitted across a medium. The medium can be any solid, liquid or gas. Some media are more suitable for transferring sound waves than others. For example, polystyrene foam is very poorly suited for sound transferrence, lending to its use as acoustic insulation.
When waves pass through a narrow gap, be they light or sound, they diffract. This creates an interference pattern of some sort, often depending on the wavelength of the sound and the size of the gap.