How to find energy of sound wave

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In the discussion about determining the energy of sound waves, the focus is on comparing three options based on their wavelength and frequency. The key equation mentioned is v = f x lambda, which relates wave speed, frequency, and wavelength. The participant calculates the frequency for option C as 1633 Hz, indicating that higher frequency correlates with greater energy. There is confusion regarding the term "on" in option A, which hinders a complete analysis. Ultimately, the conclusion is that either option A or C is likely to have the greatest energy, with a preference for C based on the frequency calculation.
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Homework Statement


In room temperature air, which of the following sound waves would have the greatest energy associated with it?

A. A wave with lambda equal to 4.7 on
B. A wave with a frequency of 2.6 Hz
C. A wave which has a distance between adjacent nodes (1/2lambda) of 21mm


Homework Equations


v = f x lambda ?
maybe KE = 1/2mv^2 and PE = PGH?
no idea.


The Attempt at a Solution


I'm not exactly sure what an "on" is (referring to letter A, unless that's supposed to be inches? not sure).

A =
?
B = 2.6 Hz
already stated
C = 1633Hz, so above B.
343 = f x .021
343/.21 = 1633Hz
I know higher frequency = higher energy.. so I know The answer is either A or C. Since I don't know what an "on" is, I'm having trouble solving for it. Thanks.
 
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