The speed of sound in air is about 334 m/s.
So, sound travels in air about 1 km in 3 seconds.
Light travels much faster.
Therefor, when you see a lightning during a thunderstorm,
you may start counting untill you here the thunder
in order to know the distance of the cloud
which causes the lightnings.
Every three counts imply one kilometer of distance.
The speed of sound in air is in our classes assumed to be
a constant for all frequencies of sound.
However, it depends on temperature and pressure.
You may find a table for that phenomenon
here.
The speed of sound in water is about 1.5 km/s.
How it depends on the conditions of water can be found
here.
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