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Speed of sound vs altitude9/5/2023 It is possible for the pitch of the voice to change since gas dynamics ( i.e., Bernoulli effect) is partially responsible for the closing frequency of the vocal folds, but I haven't been able to find any data which demonstrates such a change. The cavity resonances which determine the vocal formants would be raised by the higher sound speed, so the timbre of the voice would be different. Note that if the vibration frequency of the vocal folds does not change, the actual pitch of the voice is not higher. The high speed of sound is responsible for the amusing "Donald Duck" voice which occurs when someone has breathed in helium from a balloon. This is consistent with the general relationship for sound speed in gases since the density of helium is so much less than that of air. Graph of altitude versus speed of sound in the standard atmosphere of Earth, shown in several different speed and altitude units, including kilometers per. The speed of sound in helium at 0☌ is about 972 m/s, compared to 331 m/s in air. Speed of sound in air at standard atmospheric pressure with temperatures ranging -40 to 1000oC (-40 to 1500oF)- Imperial and SI Units. Sound speeds in other gasesīreaking the sound barrier with an aircraft Note that the sound speed is found from T, not all that accurate at high altitudes perhaps. It is not dependent upon the sound amplitude, frequency or wavelength.Ĭalculation note: You may enter temperature to calculate sound speed, or enter sound speed to calculate the corresponding temperature. ![]() That means the sound can travel through the air one kilometer in about 3 seconds or a mile. It is important to note that the sound speed in air is determined by the air itself. The speed of sound in air is about 343 m/s or 1.235 km/h or 767 mph. This sound speed does not apply to gases other than air, for example the helium from a balloon. At 200☌ this relationship gives 453 m/s while the more accurate formula gives 436 m/s. If you measured sound speed in your oven, you would find that this relationship doesn't fit. ![]() This calculation is usually accurate enough for dry air, but for great precision one must examine the more general relationship for sound speed in gases. The speed of sound is m/s = ft/s = mi/hr. The speed of sound in dry air is given approximately byįor temperatures reasonably close to room temperaature, where T C is the celsius temperature,
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