Eli5: Does all sound travel at exactly the speed of sound? If so why?

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Do quieter sounds travel at the same speed but for less distance?

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Yes, all sounds travel at the speed of sound.

The amplitude (soft/loud) and frequency (high/low tone) don’t matter. They influence the amount of energy the soundwave has, but not the speed at which this soundwave propagates.

However, that speed of sound is not fixed, just as the speed of light is not fixed. It is highly dependant on the medium it travels through.

Sound will move more quickly in solid objects than in water or air. Even in air, the speed of sound depends on temperature, barometric pressure, etc…

And just as an additional fact: The wavelength of a frequency is dependant on the speed of the wave, so the same frequency sound can have (slightly) different wavelengths when the air pressure changes.

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