Answer:
I don't know answer. ssza
When air<span> particles bunch up, it's </span>called<span> a compression-rarefaction.
When the </span>particles spread apart<span> its </span>called<span> a rarefaction.
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We have to convert Gm/s to m/s.
As 
Therefore the speed of light in vacuum,

Thus, the speed of light in m/s is 
Answer:
because ionic bonds are strong, a lot of energy is needed to break them. They are all solids at room temperature.
Explanation: