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Resonance
Romantic, in the second half of the 1800s.
In a simplistic way, pitches are nothing more than vibrations in the air. These vibrations happen at certain frequencies (the number of vibrations per second, measured in Hertz). The more vibrations per second the higher we perceive that pitch to be. A440 is now the tuning standard - that means that that A, in the middle of the treble staff, vibrates 440 times per second, or at 440 Hz. A note an octave higher would vibrate at 880 Hz and an octave lower vibrates at 220 Hz. Most tuning forks are pitched at A440, but you can get other notes (and even other temperaments). Those other notes vibrate at different frequencies, so the number on the tuning fork correspond to the numbers of vibrations-per-second that tuning fork makes.
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The frequency of vibrations in music is measured in Hertz (Hz). This unit represents the number of vibrations per second. In music, different pitches are created by varying the frequency of vibrations produced by the sound waves.
1;500 per second
The idea is that our ears have organs which are specifically designed to detect those vibrations. Note that only vibrations between about 20 and 20,000 hertz (i.e., cycles per second) can be detected by human ears.
The number of vibrations per second is called frequency. It is measured in hertz (Hz).
If an object is producing a sound of 440 Hz, it means that the object is vibrating back and forth 440 times per second. This vibration frequency determines the pitch of the sound produced by the object.
Low pitched sounds are produced by vibrations with lower frequency, meaning they have fewer vibrations per second. For example, a larger object vibrating more slowly can create a low-pitched sound. The slower the vibrations, the lower the pitch of the sound produced.
The interval of eight diatonic degrees between two tones of the same name, the higher of which has twice as many vibrations per second as the lower.
Sound is produced by vibrations that travel through a medium, such as air. For human hearing, these vibrations typically need to occur between 20 Hz and 20,000 Hz. Below 20 Hz, the vibrations are too slow to be audible, and above 20,000 Hz they are considered ultrasonic.
In a radio wave of 101.7 MHz, the frequency represents 101.7 million vibrations per second. This is because 1 MHz is equal to 1 million hertz (vibrations per second).
The frequency - that is, the number of vibrations per second. Lower notes have less vibrations per second.
High C corresponds to a frequency of 4,186 Hz, which means it produces 4,186 vibrations per second.
The frequency of a sound wave is interpreted as pitch, with higher frequencies producing higher pitch sounds and lower frequencies producing lower pitch sounds. This is because frequency is a measure of how many vibrations occur per second in the wave.