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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.
Not all sound that hits matter is absorbed. Some of it is reflected. That means sound bounces off the solid matter the way a tennis ball bounces off a wall. Sound reflected back to its source is an echo.
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.
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.
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.
Examples of longitudinal waves other than sound include seismic waves (such as P-waves and S-waves), ultrasonic waves used in medical imaging, and waves in slinkies or springs. These waves propagate through a medium by causing particles to vibrate parallel to the direction of wave travel.
When sound waves hit a barrier, they can be absorbed, reflected, or transmitted. The barrier will block some of the sound energy, causing it to decrease in intensity as it interacts with the barrier. Sound waves can also diffract around the edges of the barrier, affecting how the sound is heard on the other side.
Examples of periodic waves include ocean waves, sound waves, and the electromagnetic waves that make up visible light. These waves exhibit a pattern of repeating peaks and troughs over time or space.
Some examples of mechanical waves are Sound, waves in a slinky, and water. Mechanical waves need matter to move. Some examples of electromagnetic waves are Radio, Gamma, X-rays, Infra-red, and Microwaves Electromagnetic waves are able to travel through a medium of liquids, solids, and geaseous states, or through space where there is no material at all, called "vacuum".