The frequency of a tuning fork is unknown.

Question

Kyle uses an air column at 27 degrees and find resonance spaced by 20.2 cm. What is the frequency of the tuning fork?

 

ans. 859Hz

 

ps. How do I get the answer? Thnx!

Answer 1

You must have the information for speed, v

 

v = 347 m/s at 27ºC

resonance spacing = λ/2 = 0.202 m

then λ = 0.404 m

 

f = v/λ

 

f = 347 m/s / 0.404 m

f = 859 Hz

 

Source page for you.

http://www.vrhs.reg4.k12.ct.us/UserFiles/Servers/Server_177199/File/Kimmett%20Science/Answers%20to%20ch.%2015%20Sound%20book%20problems.pdf