# Homework Help: How to find energy of sound wave

1. Jan 3, 2012

### MySecretAlias

1. The problem statement, all variables and given/known data
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

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

3. 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.

2. Jan 3, 2012

### MySecretAlias

I'm so confused :*(

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