When sound is created, the air particles vibrate and collide with each other, causing the vibrations to pass between air particles. The vibrating particles pass the sound through to a person's ear and vibrate the ear drum. Light travels much faster than sound through air.
For example, a person fires a starting pistol and raises their hand in the air at the same time. Related Articles Properties of Infrared Light. How Does Light Travel? How to Calculate Photons Per Second. Infrared Vs. Visible Light. It means that the plane went so fast that it overtook these high-intensity waves it produces. The airplane then makes a sound called a sonic boom. This is why its sound comes to you before you ever see a plane up in the sky. It all depends on the medium since it moves at different speed trough liquid, solid, and gas medium.
Its speed depends on how dense is the medium. The noise travels through steel about 15 times faster than through air and about 4 times faster through water than through air. Sound also travels differently through different gases.
If the air is warm, it will travel much faster than in cold air. It also moves 3x faster in helium than in ordinary air. You know the funny voices you talk in when you breathe in helium? This happens because the waves travel faster and in higher frequency. The impressive organ allows us to hear all kinds of sounds at different frequencies and distances.
The waves travel from the outer ear and through the auditory canal. This causes the eardrum to vibrate which then causes the ossicles to move. The vibrations move with the oval window through the fluid in the inner ear which then stimulates many tiny hair cells. As a result, the vibrations transform into an electrical impulse that our brain perceives as sound. Sound always travels in waves regardless of whether it goes through a gas, liquid or a solid medium.
They move by particles that collide with one another. The bond between molecules is usually much weaker, and it keeps breaking and re-forming. Once the pressure is raised at least a little bit, the liquid causes the particles to move to areas with lower pressure. These molecules then push those that are already there causing the pressure to grow in the area. Molecules have inertia, so they usually go farther than it takes to even out the pressure. The process repeats until the waves carry the energy away.
The best example of this are the multiple waves that spread out from where you drop a rock in the water. Gases react much like the liquids. Since they are less dense, gases are more compressible. Sound travels faster when the materials are less dense and more compressed. The compressibility change has a more significant effect on the wave than when the density changes. The tapping becomes the initial disturbance.
Each tap sends vibrations through the table. The particles in the table collide with each other and become the medium for the sound. The particles in the table collide with air particles between the table and your eardrum. When a wave moves from one medium to another like this, it's called transmission. The air particles collide with your ear's tympanic membrane , also known as the eardrum. This sets off a series of vibrations in several structures inside the ear. The brain interprets these vibrations as sounds.
The whole process is pretty complex. You can learn more in How Hearing Works. So, sound needs a physical medium in order to travel anywhere.
0コメント