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lilxanop
this answer was 2 on this test and i know this because i took the test and i got it right and who ever pick 3 that's not the correct answer....................

Answer: 2

Explanation:

Frequency can be defined as the number of oscillations or waves per second. It is measure in Hz.

1 Hz = 1 s⁻¹

In a longitudinal wave is the from one compression to another or one rarefaction to another. Here, there are 2 waves in 1 second. Thus, the frequency of the wave is 2 Hz.