I don't know about hard to make, but it's impossible to make a mechanical wave transmit energy through a vacuum.
Ionic compounds are always salts forming between a metal and a non-metal
Examples include, but are not limited to
NaCl
BaF2
Cs2O
Sometimes an ionic compound can be composed of a metal + a polyatomic ion
Examples of polyatomic ions include
Phosphate PO4 3-
Chlorate ClO3-
Some ionic compounds with these polyatomic ions include
CsClO3
Ba3(PO4)2
Hope this helps. I can’t do much good if I can’t see the options.
Well for you to get 980 Hz you divided 344 m/s with .35 m
Apply the Conservation of Linear Momentum:
Solving further:
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