![]() Taking speed of sound at STP (Temp and pressure 1 bar) as 331. General expression which gives the frequency #f# of the #n^#, rounded to three places of decimal. It has its 49th key, the fifth A, also called A4, tuned to a frequency of 440 Hz (referred to as A440).ĭue to twelve-tone equal interval, frequency of each successive key is derived by multiplying frequency (also called pitch) of lower key (or dividing pitch of higher key) by a factor of the twelfth root of two. Below is a table of pitch frequencies in equal temperament, based on A4 440 Hz to the nearest Hertz (middle C C4). September 16, 2015.Let's find out frequency of note Middle C to begin with.Ī modern piano has 88 keys and is tuned to twelve-tone equal temperament. We need to find out the wave length of sound with this frequency as it travels in ear at tom temperature, so the speed of the sound is is 344 meter per second.
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