Sound

sound
For other uses of sound, see sound (disambiguation).
Sound or sound is a mechanical compression or longitudinal waves that propagate through the medium. Medium or intermediate substances may be liquid, solid, gas. So, for example, sound waves can propagate in the water, coal, or air.
Most sound is a combination of various signals, but the pure sound can theoretically be explained by the speed of oscillation or frequency measured in Hertz (Hz) and amplitude or loudness of the sound with the measurement in decibels.
Humans hear when sound waves, the vibrations in the air or other medium, to the human eardrum. Limit the frequency of sound can be heard by human ears roughly from 20 Hz to 20 kHz in general amplitude with variations in the response curve. Sounds above 20 kHz are called ultrasonic and below 20 Hz is called infrasound.

Loudness and the decibel

The sound of the train, louder than a whisper sound, because the sound of the train produces greater vibrations in the air. Loudness of sound also depends on our distance to the source of sound. Loudness is measured in decibels (dB). The sound of jet takeoff reaches about 120 dB. Being the sound of rustling leaves of about 33 dB.
Most sound is a combination of various signals, but the pure sound can theoretically be explained by the speed of oscillation or frequency measured in Hertz (Hz) and amplitude or loudness of the sound with the measurement in decibels.
Humans hear when sound waves, the vibrations in the air or other medium, to the human eardrum. Limit the frequency of sound can be heard by human ears roughly from 20 Hz to 20 kHz in general amplitude with variations in the response curve. Sounds above 20 kHz are called ultrasonic and below 20 Hz is called infrasound.

Echo

Reverberation occurs when sound is reflected by a surface, such as climbing mountains, and return to us soon after the original sound issued. Clarity of speech and music in a room or concert hall depends on how the sound resonates in it. Voice echo is the reflection of sound effects that have a time delay (delay line) from the reflection of sound after the original sound we hear.
Sound or sound is a mechanical compression or longitudinal waves that propagate through the medium. Medium or intermediate substances may be liquid, solid, gas. So, for example, sound waves can propagate in the water, coal, or air so, the echo is a reflected wave that delayed reaction time of the emitted sound waves.

Sound wave

Sound waves consist of air molecules vibrate back and forth. Each time, the molecules were packed in several places, resulting in a high pressure region, but elsewhere stretchable, resulting in a low pressure area. A wave of high pressure and low alternately moving in the air, spreading from the source of sounds. This sound wave delivers sound to the human ear, sound waves are longitudinal waves.

The speed of sound

Sound propagates in air with a speed of 1224 km / hour. The sound travels more slowly if the temperature and air pressure is lower. In the thin air and cold at an altitude of more than 11 km, the speed of sound of 1,000 km / hour. In water, the speed is 5400 km / h, much faster than in the air looking for fast propagation of sound formula is v = s: t With the sound wave's length and t the time

Resonance

An object, such as glass, musical tones when tapped because he has a natural vibration frequency of its own. If we sing the musical tone frequency equal to an object, it will vibrate. This event is called resonance. Very loud sounds can cause the glass resonate so strong to break.

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