the sound would be called "ultrasound"
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Is 20000 greater than 25? If so, then it is a safe bet that 20000 km is longer than 25 km
Yes because the sound waves are closer together or more frequent. A drum is usually larger than a teakettle, so it will have a lower resonant frequency.
No. Frequency is just a measure of "how often". It can be less than, equal to or greater than normal.
18000
The first is more commonly used and, in a usual graph, goes from bottom left to top right. The second goes from top left to bottom right. Both are equally valid.