According to the given figure, The Unknown is Frequency. Rest everything given in the options can be calculated from the given informations.
What is Frequency?
The number of times that a periodic function repeats the same sequence of values during a unit variation of the independent variable.
Formula to calculate wavelength :
λ = v/f
In the question, velocity is given . But Frequency is not given.
Hence, The unknown is Frequency. Rest everything given in the options can be calculated from the given informations.
Learn more about frequency here :
https://brainly.com/question/5102661
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