340 Hz note is played outdoors. Temperature and wave length

  • Thread starter 8parks11
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  • #1
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Homework Statement



A 340 Hz note is played outdoors on a day when the temperature is 25 degrees Celcius. What is the closest estimate of the wavelength of this note?

A) .1 m
B) 1 m
C) 10 m
D) 50 m
E) 340 m

Homework Equations



http://www.artofproblemsolving.com/Forum/latexrender/pictures/e7d4b6d614f84b4b105ead162fa94e0d.gif [Broken]

so....
http://www.artofproblemsolving.com/Forum/latexrender/pictures/b9e251aca0bff9ace83197927124a406.gif [Broken]

[PLAIN]http://www.artofproblemsolving.com/Forum/latexrender/pictures/0d2c032a601d8c290d422804dc30c00d.gif [Broken]
might be useful

The Attempt at a Solution



basically, I tried looking for velocity relative to temperature.
I used the previous equation that
[PLAIN]http://www.artofproblemsolving.com/Forum/latexrender/pictures/0d2c032a601d8c290d422804dc30c00d.gif [Broken]

but that didn't help much because I do not know m or k.
I think I'm missing a basic knowledge because I have not learned much about this stuff yet. (I only know the formula...)

someone help please!
 
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Answers and Replies

  • #2
DaveC426913
Gold Member
19,201
2,694
You're overthinknig the problem. They're trying to get you to understand as opposed to simply plug numbers in formulae.

As a ballpark figure - how far will sound travel (in feet) in one second?
How many wavelengths are we looking at in that second?
Thus, how long is one wavelength (approximately).
 
  • #3
5,428
292
You should be able to find the speed of sound in air at various temperatures and pressures listed somewhere on the internet. You only need an approximate value and you already have the necessary equation.
 
  • #4
63
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yes I figured this out. Sorry for not reposting. I found the velocity of sound at room temperature which is approximately 340.
 

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