Answer: The given reaction is a double displacement reaction.
Explanation:
A chemical reaction equation in which both positive and negative ions of two different reactants are exchanged then it is called a double displacement reaction.
For example, 
Here, hydrogen ions of
are replaced by the sodium ions of
. Also, sulfate ion of
are replaced by oxygen ion of
.
Thus, we can conclude that the given reaction is a double displacement reaction.
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Answer:
The wavelengths at which resonance occurs are proportional to the length of the instrument, so you can play different notes by changing the length. In general the larger the instrument the longer the wavelength of the fundamental and the lower the frequency range of the instrument.
Explanation: