Each person that continues the wave is like an atom passing on the vibration. No people means the Mexican Wave can't keep going — just like no atoms such as in a vacuum means sound waves can't keep moving.
Sound can be transmitted by solids, liquids and gases, as these all have atoms to pass on the vibrations. Sound energy is produced when a force causes an object or substance to vibrate. The energy is then transferred through the substance in waves, called sound waves. Sound waves, like Mexican waves, can only travel if something passes the wave on. You can produce sound energy right now! Here are some examples of how:.
Did you know that radio waves aren't actually sound energy? Even though they transmit information about sound, they are actually electromagnetic energy.
Vocal sound energy is created when expelled air from our lungs passes through the vocal folds. Sound energy is the movement of energy through a substance — such as air or water — in the form of waves. It is produced when a force causes an object or substance to vibrate. The next time you're in an area where there are a lot of vehicles or businesses, pay attention to the sound energy examples present there. Musical instruments make pleasant sounds, assuming that they are being operated by someone who knows how to play them.
What sounds like music to your ears is also an example of sound energy. If you're near an instrument while it is being played, you can sometimes feel the vibrations. The human body makes a lot of noises. Some sound energy produced by the human body is involuntary, while some represents noises that people make on purpose.
Pay attention to the various sounds your body makes throughout the day. You just might be surprised to discover how much sound energy comes directly from you. Most activities produce some kind of sound.
It's hard to move around or use any kind of object without producing sound energy. Almost everything you do produces sound energy. For example, a tuning fork for A above middle C will vibrate times per second and has a frequency of Hertz. When a wave is created, the distance between one compression and the next compression is called the wavelength. The faster the sound waves pass a given point, the shorter the wavelength and the higher the frequency.
Sounds of all frequencies travel at the same rate in the same medium. Sound in dry air at 0 C travels at the rate of kilometers per hour, or The vibrations can also "squeeze" the air molecules together very hard or very gently. This squeezing is called "amplitude" and is represented on the top half of the diagram below. The bottom half of the diagram is a representation of the pressure of the air during a sound wave.
The horizontal line represents normal air pressure. The more we push an object to make it vibrate, the larger the vibrations and the louder the sound, or the greater the amplitude.
Sound waves with the same frequency can have different amplitudes. Since sound is a form of energy, it can be changed from one form to another. Other forms of energy can be transformed into sound. Sound energy can be changed into electrical energy.
Sound waves that are changed into electricity can be seen on an oscilloscope. Sound travels quickly in air at nearly meters per second but can travel through steel at about 5, meters per second. When you go to a rock concert, you may have to cover your ears because the sound is so loud. This loudness is called intensity. Intensity is measured in units called decibels or dB. The threshold of sound is 0dB. A rock concert has an intensity of decibels.
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