21.58 Megahertz.
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mega = 1,000,000 1MHz = 1,000,000 Hz.
If a bulb has 50 Hz frequency and it's supply is 60 Hz frequency, it will still glow, despite the allowance of 10 HZ frequency.
Hz = hertz ,which is a measure of frequency. It is equivalent to cycles per second. Your home power is 60 Hz if you live in USA.
It is a motor where the frequency of the AC voltage is 50 cycles per second. In U.S.A. 60 Hz is standard. 50 Hz would be overseas.
loudbetween 1,000 Hz and 5,000 Hz ... centered at 3500 Hz - a very sensitive frequency range for the human ear .. go figure