AM radio stations I believe
The sun is approximately 27,000 light years away from the center of our galaxy.
Both have positive charge. In fact, an alpha particle IS a nucleus of a Helium atom.
The harmonic frequency of a musical instrument is the minimum frequency at which a string that is fixed at both ends in the instrument may vibrate. The harmonic frequency is known as the first harmonic. Each subsequent harmonic has a frequency equal to:
n*f, where n is the number of the harmonic and f is the harmonic frequency. Therefore, the harmonic frequency may be calculated using:
f = 100 / 2
f = 50 Hz
