Frequency describes the number of waves that pass a fixed place in a given amount of time. So if the time it takes for a wave to pass is is 1/2 second, the frequency is 2 per second. If it takes 1/100 of an hour, the frequency is 100 per hour.
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Of course, elephants are known to use low sound waves to communicate far away and bats are known to use echolocation to find prey and avoid obstacles.
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Backward chaining starts with a goal then searches back. Forward chaining starts with facts and searches forward.
Answer:
two hydrogen atom
Explanation:
Sulfuric Acid, H2SO4 is a chemical compound made up of two hydrogen atom, one sulfer atom, and four oxygen atoms.
