Physics

Two sound waves are traveling through a container of unknown gas. Wave A has a wavelength of 1.2 m. Wave B has a wavelength of 3.6 m. The frequency of wave B must be __________ the frequency of wave A.
a. one-ninth
b. one-third
c. the same as
d. three times larger than

the answer is one third but i do not understand why some one please attempt to give some sort of explanation. Thank you!

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  1. they both travel with the same speed. So, a longer wavelength means it oscillates more slowly.

    Recall that

    v = λf

    3λ means f/3 to get the same v.

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