Hertz is a unit to measure frequency. Number of waves passing through a particular point in unit time is considered to define frequency. The unit for frequency is inverse seconds.
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That depends on the type of siren. If you mean a Q then there is no set frequency.
If by greatest frequency you mean highest frequency, we know that the upper end of the electromagnetic spectrum has the greatest frequency. This is the home to the gamma rays. They have the highest frequency, shortest wavelength, and the greatest energy.
Energy. (if you mean E=h*ni) If you're referring to sound then the greater the frequency the smaller the wave length. (v=lambda*f)
increasing wavelength means shorter frequency.
If you mean the pitch of a sound, that is related to its frequency. The SI unit is the Hertz.