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1. If 31 waves pass by a point in 1.7 s, what's the frequency?

2. if a crest with an amplitude of 7cm interferes with a trough with an amplitude of 10 cm, the resulting wave has an amplitude of:

yes

yes

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the question i need help answering or verifying is "which has the greatest amplitude, a crest or a trough, or are their amplitudes the same?

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