Good afternoon!
the answer to that particular question is this
rule
a particular pitch directly corresponds to frequency in that if you have a pitch you will have a high frequency
if you a low frequency you will have a low pitch
both are intertwined in marriage!
The most common metals used for permanent magnets are iron, nickel, cobalt and some alloys of rare earth metals
The numerical value for the acceleration of gravity is most accurately known as 9.8 m/s/s.